Environmental Chemistry — JEE Previous Year Questions

Every Environmental Chemistry question asked in JEE Main and JEE Advanced across the last 186 papers — 89 questions, each with its correct answer. Free to read, no account needed.

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Papers it appeared in

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Appearance rate

45%

All 89 Environmental Chemistry questions

Most recent papers first.

Q1·ChemistrySingle correctJEE Main 2023

The possibility of photochemical smog formation will be minimum at

(A)Kolkata in October
(B)Mumbai in May
(C)New-Delhi in August (Summer)
(D)Srinagar, Jammu and Kashmir in January

Q2·ChemistrySingle correctJEE Main 2023

The radical which mainly causes ozone depletion in the presence of UV radiations is:

(A) $CH_{3}^{\bullet}$
(B) $NO^{\bullet}$
(C) $Cl^{\bullet}$
(D) $\dot{O}H$

Q3·ChemistrySingle correctJEE Main 2023

Which of the following are the Green house gases? A. Water vapour B. Ozone C.

I_2

D. Molecular hydrogen. Choose the most appropriate answer from the options given below:

(A)B and C only
(B)C and D only
(C)A and D only
(D)A and B only

Q4·ChemistrySingle correctJEE Main 2023

Match List I (pollutant source) with List II (environmental effect). Choose the correct answer from the options given below:

List I	List II
A.Nitrogen oxides in air	I.Eutrophication
B.Methane in air	II.pH of rain water becomes 5.6
C.Carbon dioxide	III.Global warming
D.Phosphate fertilisers in water	IV.Acid rain

(A)A-IV, B-III, C-II, D-I
(B)A-II, B-III, C-IV, D-I
(C)A-I, B-III, C-II, D-IV
(D)A-IV, B-II, C-III, D-I

Q5·ChemistrySingle correctJEE Main 2023

Given below are two statements: Statement-I: If BOD is 4 ppm and dissolved oxygen is 8 ppm, then it is a good quality water. Statement-II: If the concentration of zinc and nitrate salts are 5 ppm each, then it can be a good quality water. In the light of the above statements, choose the most appropriate answer from the options given below:

(A)Both the statements I and II are correct
(B)Statement I is incorrect but Statement II is correct
(C)Both the statements I and II are incorrect
(D)Statement I is correct but Statement II is incorrect

Q6·ChemistrySingle correctJEE Main 2023

Match List-I (Industry) with List-II (Waste Generated). Choose the correct answer from the options given below:

List I (Industry)	List II (Waste Generated)
A.Steel plants	I.Gypsum
B.Thermal power plants	II.Fly ash
C.Fertilizer industries	III.Slag
D.Paper mills	IV.Bio-degradable Wastes

(A)(A)-(III), (B)-(II), (C)-(I), (D)-(IV)
(B)(A)-(II), (B)-(III), (C)-(IV), (D)-(I)
(C)(A)-(IV), (B)-(I), (C)-(II), (D)-(III)
(D)(A)-(I), (B)-(II), (C)-(IV), (D)-(III)

Q7·ChemistrySingle correctJEE Main 2023

The delicate balance of

\text{CO}_2

and

\text{O}_2

is NOT disturbed by:

(A)Burning of coal
(B)Deforestation
(C)Burning of petroleum oil
(D)Respiration

Q8·ChemistrySingle correctJEE Main 2023

Which of these reactions is not a part of the breakdown of ozone in the stratosphere?

(A) $ClO(g)+O(g)\rightarrow Cl(g)+O_2(g)$
(B) $Cl(g)+O_3(g)\rightarrow ClO(g)+O_2(g)$
(C) $2\,ClO\rightarrow ClO_2(g)+Cl(g)$
(D) $CF_2Cl_2(g)\xrightarrow{uv}Cl(g)+CF_2Cl(g)$

Q9·ChemistrySingle correctJEE Main 2023

Match List-I (Species) with List-II (Maximum allowed concentration in ppm in drinking water). Choose the correct answer:

List-I (Species)	List-II (Maximum allowed concentration in ppm in drinking water)
A. $F^-$	I.< 50 ppm
B. $SO_4^{2-}$	II.< 5 ppm
C. $NO_3^-$	IV.< 500 ppm
D.Zn	III.< 2 ppm

(A)A-II, B-I, C-III, D-IV
(B)A-IV, B-III, C-II, D-I
(C)A-I, B-II, C-III, D-IV
(D)A-III, B-II, C-I, D-IV

Q10·ChemistrySingle correctJEE Main 2023

The possibility of photochemical smog formation is more at:

(A)The places with healthy vegetation
(B)Himalayan villages in winter
(C)Marshy lands
(D)Industrial areas

Q11·ChemistrySingle correctJEE Main 2023

The group of chemicals used as pesticide is

(A)Sodium chloride, DDT, PAN
(B)Aldrin, Sodium chlorate, Sodium arsinite
(C)DDT, Aldrin
(D)Dieldrin, Sodium arsinite, Tetrachloroethene

Q12·ChemistrySingle correctJEE Main 2023

How can photochemical smog be controlled?

(A)By using catalytic convertors in the automobiles/industry.
(B)By complete combustion of fuel.
(C)By using tall chimneys.
(D)By using catalyst.

Q13·ChemistrySingle correctJEE Main 2023

The industrial activity held least responsible for global warming is:

(A)Industrial production of urea
(B)Electricity generation in thermal power plants
(C)steel manufacturing
(D)manufacturing of cement

Q14·ChemistrySingle correctJEE Main 2023

The normal rain water is slightly acidic and its pH value is 5.6 because of which one of the following:

(A) $CO_2+H_2O\rightarrow H_2CO_3$
(B) $2SO_2+O_2+2H_2O\rightarrow 2H_2SO_4$
(C) $4NO_2+O_2+2H_2O\rightarrow 4HNO_3$
(D) $N_2O_5+H_2O\rightarrow 2HNO_3$

Q15·ChemistrySingle correctJEE Main 2023

Formation of photochemical smog involves the following reaction in which A, B and C are respectively. i.

NO_2\xrightarrow{h\nu}A+B

ii.

B+O_2\rightarrow C

iii.

A+C\rightarrow NO_2+O_2

. Choose the correct answer from the options given below:

(A) $O,\ N_2O\ \&\ NO$
(B) $O,\ NO\ \&\ NO_3^-$
(C) $NO,\ O\ \&\ O_3$
(D) $N,\ O_2\ \&\ O_3$

Q16·ChemistrySingle correctJEE Main 2023

The water quality of a pond was analysed and its BOD was found to be 4. The pond has:

(A)Highly polluted water
(B)Slightly polluted water
(C)Water has high amount of fluoride compounds
(D)Very clean water

Q17·ChemistrySingle correctJEE Main 2023

Correct statement about smog is:

(A)Classical smog also has high concentration of oxidizing agents
(B)Both NO $_2$ and SO $_2$ are present in classical smog
(C)NO $_2$ is present in classical smog
(D)Photochemical smog has high concentration of oxidizing agents

Q18·ChemistrySingle correctJEE Main 2023

The concentration of dissolved Oxygen in water for growth of fish should be more than

X

ppm and Biochemical Oxygen Demand in clean water should be less than

Y

ppm.

X

and

Y

in ppm are, respectively.

(A) $X=4,\,Y=8$
(B) $X=6,\,Y=5$
(C) $X=4,\,Y=15$
(D) $X=6,\,Y=12$

Q19·ChemistrySingle correctJEE Main 2023

A. Ammonium salts produce haze in atmosphere. B. Ozone gets produced when atmospheric oxygen reacts with chlorine radicals. C. Polychlorinated biphenyls act as cleansing solvents. D. 'Blue baby' syndrome occurs due to the presence of excess of sulphate ions in water. Choose the correct answer from the options given below:

(A)A and D only
(B)A, B and C only
(C)A and C only
(D)B and C only

Q20·ChemistrySingle correctJEE Main 2023

Some reactions of

NO_2

relevant to photochemical smog formation are:

NO_2 \xrightarrow{sunlight} X + Y

; then

\rightarrow A

; then

\rightarrow B

. Identify A, B, X and Y.

(A) $X=\dfrac{1}{2}O_2, Y=NO_2, A=O_3, B=O_2$
(B) $X=[O], Y=NO, A=O_2, B=O_3$
(C) $X=N_2O, Y=[O], A=O_2, B=NO$
(D) $X=NO, Y=[O], A=O_2, B=N_2O_3$

Q21·ChemistrySingle correctJEE Main 2023

Which of the following is true about freons?

(A)These are radicals of chlorine and chlorine monoxide
(B)These are chemicals causing skin cancer
(C)These are chlorofluorocarbon compounds
(D)All radicals are called freons

Q22·ChemistrySingle correctJEE Main 2023

Correct statement is:

(A)An average human being consumes nearly 15 times more air than food
(B)An average human being consumes 100 times more air than food
(C)An average human being consumes equal amount of food and air
(D)An average human being consumes more food than air

Q23·ChemistrySingle correctJEE Main 2022

Dinitrogen is a robust compound, but reacts at high altitude to form oxides. The oxide of nitrogen that can damage plant leaves and retard photosynthesis is :

(A)NO
(B)NO $_{3}^{-}$
(C)NO $_{2}$
(D)NO $_{2}^{-}$

Q24·ChemistrySingle correctJEE Main 2022

Which among the following pairs has only herbicides ?

(A)Aldrin and Dieldrin
(B)Sodium chlorate and Aldrin
(C)Sodium arsinate and Dieldrin
(D)Sodium chlorate and sodium arsinite.

Q25·ChemistrySingle correctJEE Main 2022

Given below are two statements : Statement I : In polluted water values of both dissolved oxygen and BOD are very low. Statement II : Eutrophication results in decrease in the amount of dissolved oxygen. In the light of the above statements, choose the most appropriate answer from the options given below :

(A)Both Statement I and Statement II are true
(B)Both Statement I and Statement II are false
(C)Statement I is true but Statement II is false
(D)Statement I is false but Statement II is true

Q26·ChemistrySingle correctJEE Main 2022

Match List I with List II Choose the correct answer from the options given below:

List I (Pollutant)	List II (Disease /sickness)
A.Sulphate (>500 ppm)	I.Methemoglobinemia
B.Nitrate (>50 ppm)	II.Brown mottling of teeth
C.Lead (> 50 ppb)	III.Laxative effect
D.Fluoride (>2 ppm)	IV.Kidney damage

(A)A-IV, B –I, C-II, D-III
(B)A-III, B –I, C-IV, D-II
(C)A-II, B –IV, C-I, D-III
(D)A-II, B –IV, C-III, D-I

Q27·ChemistrySingle correctJEE Main 2022

Given below are two statements: Statement I : The non bio-degradable fly ash and slag from steel industry can be used by cement industry. Statement II : The fuel obtained from plastic waste is lead free. In the light of the above statements, choose the most appropriate answer from the options given below:

(A)Both Statement I and Statement II are correct
(B)Both Statement I and Statement II are incorrect
(C)Statement I is correct but Statement II is incorrect
(D)Statement I is incorrect but Statement II is correct

Q28·ChemistrySingle correctJEE Main 2022

Match List I with List II Choose the correct answer from the options given below :

List I (Pollutant)	List II (Source)
A.Microorganisms	I.Strip mining
B.Plant nutrients	II.Domestic sewage
C.Toxic heavy metals	III.Chemical fertilizer
D.Sediment	IV.Chemical factory

(A)A-II, B-III, C-IV, D-I
(B)A-II, B-I, C-IV, D-III
(C)A-I, B-IV, C-II, D-III
(D)A-I, B-IV, C-III, D-II

Q29·ChemistrySingle correctJEE Main 2022

\overset{\bullet}{\mathrm{C}}\mathrm{l}

+ CH

_4

→ A + B A and B in the above atmospheric reaction step are

(A)C $_2$ H $_6$ and Cl $_2$
(B) $\overset{\bullet}{\mathrm{C}}\mathrm{HCl}_2$ and H $_2$
(C) $\overset{\bullet}{\mathrm{C}}\mathrm{H}_3$ and HCl
(D)C $_2$ H $_6$ and HCl

Q30·ChemistrySingle correctJEE Main 2022

The photochemical smog does not generally contain :

(A)NO
(B) $NO_{2}$
(C) $SO_{2}$
(D)HCHO

Q31·ChemistrySingle correctJEE Main 2022

Sulphur dioxide is one of the components of polluted air. SO

_2

is also a major contributor to acid rain. The correct and complete reaction to represent acid rain caused by SO

_2

is :

(A)2 SO $_2$ + O $_2$ $\rightarrow$ 2 SO $_3$
(B)SO $_2$ + O $_3$ $\rightarrow$ SO $_3$ + O $_2$
(C)SO $_2$ + H $_2$ O $_2$ $\rightarrow$ H $_2$ SO $_4$
(D)2 SO $_2$ + O $_2$ + 2 H $_2$ O $\rightarrow$ 2 H $_2$ SO $_4$

Q32·ChemistrySingle correctJEE Main 2022

The acid that is believed to be mainly responsible for the damage of Taj Mahal is

(A)Sulfuric acid
(B)Hydrofluoric acid
(C)Phosphoric acid
(D)Hydrochloric acid

Q33·ChemistrySingle correctJEE Main 2022

Correct statement about photo-chemical smog is :

(A)It occurs in humid climate.
(B)It is a mixture of smoke, fog and SO $_2$
(C)It is reducing smog.
(D)It results from reaction of unsaturated hydrocarbons.

Q34·ChemistrySingle correctJEE Main 2022

Which amongst the following is not a pesticide ?

(A)DDT
(B)Organophosphates
(C)Dieldrin
(D)Sodium arsenite

Q35·ChemistrySingle correctJEE Main 2022

Given below are two statements: Statement I: Classical smog occurs in cool humid climate. It is a reducing mixture of smoke, fog and sulphur dioxide Statement II: Photochemical smog has components, ozone, nitric oxide, acrolein, formaldehyde, PAN etc. In the light of above statements, choose the most appropriate answer from the options give below

(A)Both Statement I and Statement II are correct
(B)Both Statement I and Statement II are incorrect
(C)Statement I is correct but statement II is incorrect
(D)Statement I is incorrect but Statement II is correct

Q36·ChemistrySingle correctJEE Main 2022

On the surface of polar stratospheric clouds, hydrolysis of chlorine nitrate gives A and B while its reaction with HCl produces B and C. A, B and C are, respectively

(A)HOCl, HNO $_3$ , Cl $_2$
(B)Cl $_2$ , HNO $_3$ , HOCl
(C)HClO $_2$ , HNO $_2$ , HOCl
(D)HOCl, HNO $_2$ , Cl $_2$ O

Q37·ChemistrySingle correctJEE Main 2022

Polar stratospheric clouds facilitate the formation of :

(A) $ClONO_{2}$
(B)HOCl
(C)ClO
(D) $CH_{4}$

Q38·ChemistrySingle correctJEE Main 2022

The measured BOD values for four different water samples (A-D) are as follows: A = 3 ppm; B = 18 ppm; C = 21 ppm; D = 4 ppm. The water samples which can be called as highly polluted with organic wastes, are

(A)A and B
(B)A and D
(C)B and C
(D)B and D

Q39·ChemistrySingle correctJEE Main 2022

The eutrophication of water body results in :

(A)loss of Biodiversity
(B)breakdown of organic matter
(C)increase in biodiversity
(D)decrease in BOD.

Q40·ChemistrySingle correctJEE Main 2022

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: Polluted water may have a value of BOD of the order of 17 ppm. Reason R: BOD is a measure of oxygen required to oxidise both the biodegradable and non-biodegradable organic material in water. In the light of the above statements, choose the most appropriate answer from the options given below.

(A)Both A and R are correct and R is the correct explanation of A.
(B)Both A and R are correct but R is NOT the correct explanation of A.
(C)A is correct but R is not correct.
(D)A is not correct but R is correct.

Q41·ChemistrySingle correctJEE Main 2022

Some gases are responsible for heating of atmosphere (green house effect). Identify from the following the gaseous species which does not cause it.

(A)CH $_4$
(B)O $_3$
(C)H $_2$ O
(D)N $_2$

Q42·ChemistrySingle correctJEE Main 2021

Water sample is called cleanest on the basis of which one of the BOD values given below

(A)11 ppm
(B)15 ppm
(C)3 ppm
(D)21 ppm

Q43·ChemistrySingle correctJEE Main 2021

BOD values (in ppm) for clean water (A) and polluted water (B) are expected respectively :

(A)A > 50, B < 27
(B)A > 25, B < 17
(C)A < 5, B > 17
(D)A > 15, B > 47

Q44·ChemistrySingle correctJEE Main 2021

The deposition of X and Y on ground surfaces is referred as wet and dry depositions, respectively. X and Y are :

(A)X = Ammonium salts, Y = $\mathrm{CO_2}$
(B)X = $\mathrm{SO_2}$ , Y = Ammonium salts
(C)X = Ammonium salts, Y = $\mathrm{SO_2}$
(D)X = $\mathrm{CO_2}$ , Y = $\mathrm{SO_2}$

Q45·ChemistrySingle correctJEE Main 2021

The gas 'A' is having very low reactivity reaches to stratosphere. It is non-toxic and non-flammable but dissociated by UV-radiations in stratosphere. The intermediates formed initially from the gas 'A' are :

(A) $\mathrm{Cl}\dot{\mathrm{O}} + \dot{\mathrm{C}}\mathrm{F_2Cl}$
(B) $\mathrm{Cl}\dot{\mathrm{O}} + \dot{\mathrm{C}}\mathrm{H_3}$
(C) $\dot{\mathrm{C}}\mathrm{H_3} + \dot{\mathrm{C}}\mathrm{F_2Cl}$
(D) $\dot{\mathrm{C}}\mathrm{l} + \dot{\mathrm{C}}\mathrm{F_2Cl}$

Q46·ChemistrySingle correctJEE Main 2021

In stratosphere most of the ozone formation is assisted by :

(A)cosmic rays.
(B)γ–rays.
(C)ultraviolet radiation.
(D)visible radiations.

Q47·ChemistrySingle correctJEE Main 2021

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Photochemical smog causes cracking of rubber. Reason (R) : Presence of ozone, nitric oxide, acrolein, formaldehyde and peroxyacetyl nitrate in photochemical smog makes it oxidizing. Choose the most appropriate answer from the options given below :

(A)Both (A) and (R) are true but (R) is not the true explanation of (A)
(B)(A) is false but (R) is true.
(C)(A) is true but (R) is false
(D)Both (A) and (R) are true and (R) is the true explanation of (A)

Q48·ChemistrySingle correctJEE Main 2021

Match List – I with List – II: List – I (compound) List – II (effect / affected species) (a) Carbon monoxide (i) Carcinogenic (b) Sulphur dioxide (ii) Metabolized by pyrus plants (c) Polychlorinated biphenyls (iii) Haemoglobin (d) Oxides of nitrogen (iv) Stiffness of flower buds Choose the correct answer from the options given below:

(A)(a) –(iv), (b) –(i), (c) – (iii), (d) – (ii)
(B)(a) – (i), (b) –(ii), (c) – (iii), (d) – (iv)
(C)(a) – (iii), (b) – (iv), (c) – (ii), (d) – (i)
(D)(a) – (iii), (b) – (iv), (c) – (i), (d) – (ii)

Q49·ChemistrySingle correctJEE Main 2021

Which one of the following statements is NOT correct?

(A)Eutrophication indicates that water body is polluted
(B)Eutrophication leads to increase in the oxygen level in water
(C)Eutrophication leads to anaerobic conditions
(D)The dissolved oxygen concentration below 6 ppm inhibits fish growth

Q50·ChemistrySingle correctJEE Main 2021

Given below are two statements: Statement I : Chlorofluoro carbons breakdown by radiation in the visible energy region and release chlorine gas in the atmosphere which then reacts with stratospheric ozone. Statement II : Atmospheric ozone reacts with nitric oxide to give nitrogen and oxygen gases, which add to the atmosphere. For the above statements choose the correct answer from the options given below:

(A)Statement I is incorrect but Statement II is true
(B)Both Statement I and II are correct
(C)Both Statement I and II are false
(D)Statement I is correct but Statement II is false

Q51·ChemistrySingle correctJEE Main 2021

Which one of the following gases is reported to retard photosynthesis ?

(A) $\mathrm{CO_2}$
(B)CFCs
(C) $\mathrm{CO}$
(D) $\mathrm{NO_2}$

Q52·ChemistrySingle correctJEE Main 2021

Green chemistry in day- to day life is in the use of:

(A)Chlorine for bleaching of paper
(B)Large amount of water alone for washing clothes
(C)Liquified $CO_{2}$ for dry cleaning of clothes
(D)Tetrachloroethene for laundry

Q53·ChemistrySingle correctJEE Main 2021

The satements that are TRUE : (A) Methane leads to both global warming and photochemical smog (B) Methane is generated from paddy fields (C) Methane is a stronger global warming gas than CO

_{2}

(D) Methane is a part of reducing smog Choose the most appropriate answer from the options given below :

(A)(A), (B), (C) only
(B)(A) and (B) only
(C)(B), (C), (D) only
(D)(A), (B), (D) only

Q54·ChemistrySingle correctJEE Main 2021

Given below are two statements : Statement I : Non-biodegradable wastes are generated by the thermal power plants. Statement II : Bio-degradable detergents leads to eutrophication. In the light of the above statements, choose the most appropriate answer from the option given below :

(A)Both statement I and statement II are false
(B)Statement I is true but statement II is false
(C)Statement I is false but statement II is true
(D)Both statement I and statement II are true.

Q55·ChemistrySingle correctJEE Main 2021

Which of the following statement(s) is (are) incorrect reason for eutrophication ? (A) excess usage of fertilisers (B) excess usage of detergents (C) dense plant population in water bodies (D) lack of nutrients in water bodies that prevent plant growth Choose the most appropriate answer from the options given below :

(A)(A) only
(B)(C) only
(C)(B) and (D) only
(D)(D) only

Q56·ChemistrySingle correctJEE Main 2021

Reducing smog is a mixture of:

(A)Smoke, fog and $\mathrm{O_3}$
(B)Smoke, fog and $\mathrm{SO_2}$
(C)Smoke, fog and $\mathrm{CH_2{=}CH-CHO}$
(D)Smoke, fog and $\mathrm{N_2O_3}$

Q57·ChemistrySingle correctJEE Main 2021

The type of pollution that gets increased during the day time and in the presence of O

_{3}

is :

(A)Reducing smog
(B)Oxidising smog
(C)Global warming
(D)Acid rain

Q58·ChemistrySingle correctJEE Main 2021

The green house gas/es is (are) : (A) Carbon dioxide (B) Oxygen (C) Water vapour (D) Methane Choose the most appropriate answer from the options given below :

(A)(A) and (C) only
(B)(A) only
(C)(A), (C) and (D) only
(D)(A) and (B) only

Q59·ChemistrySingle correctJEE Main 2021

Given below are two statements: Statement-I : An allotrope of oxygen is an important intermediate in the formation of reducing smog. Statement-II : Gases such as oxides of nitrogen and sulphur present in troposphere contribute to the formation of photochemical smog. In the light of the above statements, choose the correct answer from the options given below:

(A)Statement I and Statement II are true
(B)Statement I is true about Statement II is false
(C)Both Statement I and Statement II are false
(D)Statement I is false but Statement II is true

Q60·ChemistrySingle correctJEE Main 2021

Given below are two statements : Statement I : The pH of rain water is normally ~5.6. Statement II : If the pH of rain water drops below 5.6, it is called acid rain. In the light of the above statements, choose the correct answer from the option given below.

(A)Statement I is false but Statement II is true
(B)Both statement I and statement II are true
(C)Both statement I and statement II are false
(D)Statement I is true but statement II is false

Q61·ChemistrySingle correctJEE Main 2021

The gas released during anaerobic degradation of vegetation may lead to:

(A)Global warming and cancer
(B)Acid rain
(C)Corrosion of metals
(D)Ozone hole

Q62·ChemistrySingle correctJEE Main 2021

Given below are two statements : Statement I : The value of the parameter "Biochemical Oxygen Demand (BOD)" is important for survival of aquatic life. Statement II : The optimum value of BOD is 6.5 ppm. In the light of the above statements, choose the most appropriate answer from the options given below.

(A)Both Statement I and Statement II are false
(B)Statement I is false but Statement II is true
(C)Statement I is true but Statement II is false
(D)Both Statement I and Statement II are true

Q63·ChemistrySingle correctJEE Main 2020

The present of soluble fluoride ion upto 1 ppm concentration in drinking water, is:

(A)harmful for teeth
(B)harmful to skin
(C)harmful to bones
(D)safe for teeth

Q64·ChemistrySingle correctJEE Main 2020

The condition that indicates a polluted environment is:

(A)0.03% of $CO_2$ in the atmosphere
(B)pH of rain water to be 5.6
(C)eutrophication
(D)BOD value of 5 ppm

Q65·ChemistrySingle correctJEE Main 2020

The processes of calcination and roasting in metallurgical industries, respectively, can lead to:

(A)Photochemical smog and global warming
(B)Global warming and photochemical smog
(C)Global warming and acid rain
(D)Photochemical smog and ozone layer depletion

Q66·ChemistrySingle correctJEE Main 2020

Thermal power plants can lead to:

(A)Ozone layer depletion
(B)Acid rain
(C)Blue baby syndrome
(D)Eutrophication

Q67·ChemistrySingle correctJEE Main 2020

The incorrect statement(s) among (a) – (d) regarding acid rain is (are): (a) It can corrode water pipes. (b) It can damage structures made up of stone. (c) It cannot cause respiratory ailments in animals (d) It is not harmful for trees

(A)(a), (b) and (d)
(B)(c) and (d)
(C)(a), (c) and (d)
(D)(c) only

Q68·ChemistrySingle correctJEE Main 2020

Biochemical Oxygen Demand (BOD) is the amount of oxygen required (in ppm):

(A)for the photochemical breakdown of waste present in 1 m $^3$ volume of a water body.
(B)for sustaining life in a water body.
(C)by bacteria to break-down organic waste in a certain volume of a water sample.
(D)by anaerobic bacteria to breakdown inorganic waste present in a water body.

Q69·ChemistrySingle correctJEE Main 2019

The primary pollutant that leads to photochemical smog is:

(A)acrolein
(B)nitrogen oxides
(C)ozone
(D)sulphur dioxide

Q70·ChemistrySingle correctJEE Main 2019

The correct set of species responsible for the photochemical smog is :

(A)NO, NO $_2$ , O $_3$ and hydrocarbons
(B)CO $_2$ , NO $_2$ SO $_2$ and hydrocarbons
(C)N $_2$ , NO $_2$ and hydrocarbons
(D)N $_2$ , O $_2$ , O $_3$ and hydrocarbons

Q71·ChemistrySingle correctJEE Main 2019

The regions of the atmosphere, where clouds form and where we live, respectively, are:

(A)Troposphere and Stratosphere
(B)Troposphere and Troposphere
(C)Stratosphere and Stratosphere
(D)Stratosphere and Troposphere

Q72·ChemistrySingle correctJEE Main 2019

Air pollution that occurs in sunlight is:

(A)oxidising smog
(B)acid rain
(C)reducing smog
(D)fog

Q73·ChemistrySingle correctJEE Main 2019

Excessive release of

CO_2

into the atmosphere results in:

(A)formation of smog
(B)depletion of ozone
(C)global warming
(D)polar vortex

Q74·ChemistrySingle correctJEE Main 2019

The layer of atmosphere between 10 km to 50 km above the sea level is called as:

(A)troposphere
(B)mesosphere
(C)stratosphere
(D)thermosphere

Q75·ChemistrySingle correctJEE Main 2019

Which is wrong with respect to our responsibility as a human being to protect our environment?

(A)Restricting the use of vehicles
(B)Using plastic bags
(C)Setting up compost tin in gardens
(D)Avoiding the use of floodlighted facilities.

Q76·ChemistrySingle correctJEE Main 2019

The maximum prescribed concentration of copper in drinking water is:

(A)0.5 ppm
(B)3 ppm
(C)5 ppm
(D)0.05 ppm

Q77·ChemistrySingle correctJEE Main 2019

Assertion : Ozone is destroyed by CFCs in the upper stratosphere. Reason : Ozone holes increase the amount of UV radiation reaching the earth.

(A)Assertion and reason are incorrect
(B)Assertion is false, but the reason is correct
(C)Assertion and reasons are both correct, and the reason is the correct explanation for the assertion.
(D)Assertion and reason are correct, but the reason is not the explanation for the assertion.

Q78·ChemistrySingle correctJEE Main 2019

The molecules that has minimum/no role in the formation of photochemical smog is:

(A) $N_2$
(B) $CH_2=O$
(C) $O_3$
(D)NO

Q79·ChemistrySingle correctJEE Main 2019

The upper stratosphere consisting of the ozone layer protects us from the sun's radiation that falls in the wavelength region of :

(A)200 - 315 nm
(B)400 - 550 nm
(C)0.8 - 1.5 nm
(D)600 - 750 nm

Q80·ChemistrySingle correctJEE Main 2019

Water sample with BOD vales of 4 ppm and 18 ppm respectively are

(A)Clean and clean
(B)Highly polluted and clean
(C)Clean and highly polluted
(D)Highly polluted and highly polluted.

Q81·ChemistrySingle correctJEE Main 2019

The compound that is NOT a common component of photochemical smog is :

(A)O3
(B)H3C-C(=O)-OONO2
(C)CH2=CHCHO
(D)CF2Cl2

Q82·ChemistrySingle correctJEE Main 2019

The higher concentration of which gas in air can cause stiffness of flower buds?

(A)NO $_2$
(B)CO $_2$
(C)SO $_2$
(D)CO

Q83·ChemistrySingle correctJEE Main 2019

Peroxyacetyl nitrate (PAN), an eye irritant is produced by:

(A)classical smog
(B)acid rain
(C)organic waste
(D)photochemical smog

Q84·ChemistrySingle correctJEE Main 2019

The concentration of dissolved oxygen (DO) is cold water can go upto:

(A)14 ppm
(B)8 ppm
(C)10 ppm
(D)16 ppm

Q85·ChemistrySingle correctJEE Main 2019

Taj Mahal is being slowly disfigured and discoloured. This is primarily due to:

(A)global warming
(B)acid rain
(C)water pollution
(D)soil pollution

Q86·ChemistrySingle correctJEE Main 2019

Water filled in two glasses A and B have BOD values of 10 and 20 respectively. The correct statement regarding them is

(A)B is more polluted than A
(B)A is suitable for drinking, whereas B is not
(C)both A and B are suitable for drinking
(D)A is more polluted than B

Q87·ChemistrySingle correctJEE Main 2019

The pH of rain water is approximately

(A)5.6
(B)7.5
(C)7.0
(D)6.5

Q88·ChemistrySingle correctJEE Main 2019

A water sample has ppm level concentration of the following metals: Fe = 0.2, Mn = 5.0, Cu = 3.0, Zn = 5.0. The metal that makes the water sample unsuitable for drinking is

(A)Cu
(B)Mn
(C)Fe
(D)Zn

Q89·ChemistrySingle correctJEE Main 2019

Which of the following conditions in drinking water causes methemoglobinemia?

(A)> 50 ppm of lead
(B)> 50 ppm of chloride
(C)> 50 ppm of nitrate
(D)> 100 ppm of sulphate

Environmental Chemistry — frequently asked

How many questions from Environmental Chemistry appear in JEE?

Environmental Chemistry has appeared in 83 of the last 186 JEE Main and JEE Advanced papers — about 45% of them — contributing 89 questions in total across those papers.

Is Environmental Chemistry an important chapter for JEE?

Judged by how often it is actually tested, it appears in roughly 45% of papers. Chapters above about 50% are effectively guaranteed to show up every session, so they repay thorough preparation; lower-frequency chapters are better treated as targeted revision.

Where do these Environmental Chemistry questions come from?

Every question is from an official JEE Main or JEE Advanced paper, transcribed from the original paper and tagged to this chapter. Answers follow the official answer key.

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All 89 Environmental Chemistry questions

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Q1·ChemistrySingle correctJEE Main 2023

The possibility of photochemical smog formation will be minimum at

(A)Kolkata in October
(B)Mumbai in May
(C)New-Delhi in August (Summer)
(D)Srinagar, Jammu and Kashmir in January

Q2·ChemistrySingle correctJEE Main 2023

The radical which mainly causes ozone depletion in the presence of UV radiations is:

(A) $CH_{3}^{\bullet}$
(B) $NO^{\bullet}$
(C) $Cl^{\bullet}$
(D) $\dot{O}H$

Q3·ChemistrySingle correctJEE Main 2023

Which of the following are the Green house gases? A. Water vapour B. Ozone C.

I_2

D. Molecular hydrogen. Choose the most appropriate answer from the options given below:

(A)B and C only
(B)C and D only
(C)A and D only
(D)A and B only

Q4·ChemistrySingle correctJEE Main 2023

Match List I (pollutant source) with List II (environmental effect). Choose the correct answer from the options given below:

List I	List II
A.Nitrogen oxides in air	I.Eutrophication
B.Methane in air	II.pH of rain water becomes 5.6
C.Carbon dioxide	III.Global warming
D.Phosphate fertilisers in water	IV.Acid rain

(A)A-IV, B-III, C-II, D-I
(B)A-II, B-III, C-IV, D-I
(C)A-I, B-III, C-II, D-IV
(D)A-IV, B-II, C-III, D-I

Q5·ChemistrySingle correctJEE Main 2023

(A)Both the statements I and II are correct
(B)Statement I is incorrect but Statement II is correct
(C)Both the statements I and II are incorrect
(D)Statement I is correct but Statement II is incorrect

Q6·ChemistrySingle correctJEE Main 2023

Match List-I (Industry) with List-II (Waste Generated). Choose the correct answer from the options given below:

List I (Industry)	List II (Waste Generated)
A.Steel plants	I.Gypsum
B.Thermal power plants	II.Fly ash
C.Fertilizer industries	III.Slag
D.Paper mills	IV.Bio-degradable Wastes

(A)(A)-(III), (B)-(II), (C)-(I), (D)-(IV)
(B)(A)-(II), (B)-(III), (C)-(IV), (D)-(I)
(C)(A)-(IV), (B)-(I), (C)-(II), (D)-(III)
(D)(A)-(I), (B)-(II), (C)-(IV), (D)-(III)

Q7·ChemistrySingle correctJEE Main 2023

The delicate balance of

\text{CO}_2

and

\text{O}_2

is NOT disturbed by:

(A)Burning of coal
(B)Deforestation
(C)Burning of petroleum oil
(D)Respiration

Q8·ChemistrySingle correctJEE Main 2023

Which of these reactions is not a part of the breakdown of ozone in the stratosphere?

(A) $ClO(g)+O(g)\rightarrow Cl(g)+O_2(g)$
(B) $Cl(g)+O_3(g)\rightarrow ClO(g)+O_2(g)$
(C) $2\,ClO\rightarrow ClO_2(g)+Cl(g)$
(D) $CF_2Cl_2(g)\xrightarrow{uv}Cl(g)+CF_2Cl(g)$

Q9·ChemistrySingle correctJEE Main 2023

Match List-I (Species) with List-II (Maximum allowed concentration in ppm in drinking water). Choose the correct answer:

List-I (Species)	List-II (Maximum allowed concentration in ppm in drinking water)
A. $F^-$	I.< 50 ppm
B. $SO_4^{2-}$	II.< 5 ppm
C. $NO_3^-$	IV.< 500 ppm
D.Zn	III.< 2 ppm

(A)A-II, B-I, C-III, D-IV
(B)A-IV, B-III, C-II, D-I
(C)A-I, B-II, C-III, D-IV
(D)A-III, B-II, C-I, D-IV

Q10·ChemistrySingle correctJEE Main 2023

The possibility of photochemical smog formation is more at:

(A)The places with healthy vegetation
(B)Himalayan villages in winter
(C)Marshy lands
(D)Industrial areas

Q11·ChemistrySingle correctJEE Main 2023

The group of chemicals used as pesticide is

(A)Sodium chloride, DDT, PAN
(B)Aldrin, Sodium chlorate, Sodium arsinite
(C)DDT, Aldrin
(D)Dieldrin, Sodium arsinite, Tetrachloroethene

Q12·ChemistrySingle correctJEE Main 2023

How can photochemical smog be controlled?

(A)By using catalytic convertors in the automobiles/industry.
(B)By complete combustion of fuel.
(C)By using tall chimneys.
(D)By using catalyst.

Q13·ChemistrySingle correctJEE Main 2023

The industrial activity held least responsible for global warming is:

(A)Industrial production of urea
(B)Electricity generation in thermal power plants
(C)steel manufacturing
(D)manufacturing of cement

Q14·ChemistrySingle correctJEE Main 2023

The normal rain water is slightly acidic and its pH value is 5.6 because of which one of the following:

(A) $CO_2+H_2O\rightarrow H_2CO_3$
(B) $2SO_2+O_2+2H_2O\rightarrow 2H_2SO_4$
(C) $4NO_2+O_2+2H_2O\rightarrow 4HNO_3$
(D) $N_2O_5+H_2O\rightarrow 2HNO_3$

Q15·ChemistrySingle correctJEE Main 2023

Formation of photochemical smog involves the following reaction in which A, B and C are respectively. i.

NO_2\xrightarrow{h\nu}A+B

ii.

B+O_2\rightarrow C

iii.

A+C\rightarrow NO_2+O_2

. Choose the correct answer from the options given below:

(A) $O,\ N_2O\ \&\ NO$
(B) $O,\ NO\ \&\ NO_3^-$
(C) $NO,\ O\ \&\ O_3$
(D) $N,\ O_2\ \&\ O_3$

Q16·ChemistrySingle correctJEE Main 2023

The water quality of a pond was analysed and its BOD was found to be 4. The pond has:

(A)Highly polluted water
(B)Slightly polluted water
(C)Water has high amount of fluoride compounds
(D)Very clean water

Q17·ChemistrySingle correctJEE Main 2023

Correct statement about smog is:

(A)Classical smog also has high concentration of oxidizing agents
(B)Both NO $_2$ and SO $_2$ are present in classical smog
(C)NO $_2$ is present in classical smog
(D)Photochemical smog has high concentration of oxidizing agents

Q18·ChemistrySingle correctJEE Main 2023

The concentration of dissolved Oxygen in water for growth of fish should be more than

X

ppm and Biochemical Oxygen Demand in clean water should be less than

Y

ppm.

X

and

Y

in ppm are, respectively.

(A) $X=4,\,Y=8$
(B) $X=6,\,Y=5$
(C) $X=4,\,Y=15$
(D) $X=6,\,Y=12$

Q19·ChemistrySingle correctJEE Main 2023

(A)A and D only
(B)A, B and C only
(C)A and C only
(D)B and C only

Q20·ChemistrySingle correctJEE Main 2023

Some reactions of

NO_2

relevant to photochemical smog formation are:

NO_2 \xrightarrow{sunlight} X + Y

; then

\rightarrow A

; then

\rightarrow B

. Identify A, B, X and Y.

(A) $X=\dfrac{1}{2}O_2, Y=NO_2, A=O_3, B=O_2$
(B) $X=[O], Y=NO, A=O_2, B=O_3$
(C) $X=N_2O, Y=[O], A=O_2, B=NO$
(D) $X=NO, Y=[O], A=O_2, B=N_2O_3$

Q21·ChemistrySingle correctJEE Main 2023

Which of the following is true about freons?

(A)These are radicals of chlorine and chlorine monoxide
(B)These are chemicals causing skin cancer
(C)These are chlorofluorocarbon compounds
(D)All radicals are called freons

Q22·ChemistrySingle correctJEE Main 2023

Correct statement is:

(A)An average human being consumes nearly 15 times more air than food
(B)An average human being consumes 100 times more air than food
(C)An average human being consumes equal amount of food and air
(D)An average human being consumes more food than air

Q23·ChemistrySingle correctJEE Main 2022

Dinitrogen is a robust compound, but reacts at high altitude to form oxides. The oxide of nitrogen that can damage plant leaves and retard photosynthesis is :

(A)NO
(B)NO $_{3}^{-}$
(C)NO $_{2}$
(D)NO $_{2}^{-}$

Q24·ChemistrySingle correctJEE Main 2022

Which among the following pairs has only herbicides ?

(A)Aldrin and Dieldrin
(B)Sodium chlorate and Aldrin
(C)Sodium arsinate and Dieldrin
(D)Sodium chlorate and sodium arsinite.

Q25·ChemistrySingle correctJEE Main 2022

(A)Both Statement I and Statement II are true
(B)Both Statement I and Statement II are false
(C)Statement I is true but Statement II is false
(D)Statement I is false but Statement II is true

Q26·ChemistrySingle correctJEE Main 2022

Match List I with List II Choose the correct answer from the options given below:

List I (Pollutant)	List II (Disease /sickness)
A.Sulphate (>500 ppm)	I.Methemoglobinemia
B.Nitrate (>50 ppm)	II.Brown mottling of teeth
C.Lead (> 50 ppb)	III.Laxative effect
D.Fluoride (>2 ppm)	IV.Kidney damage

(A)A-IV, B –I, C-II, D-III
(B)A-III, B –I, C-IV, D-II
(C)A-II, B –IV, C-I, D-III
(D)A-II, B –IV, C-III, D-I

Q27·ChemistrySingle correctJEE Main 2022

(A)Both Statement I and Statement II are correct
(B)Both Statement I and Statement II are incorrect
(C)Statement I is correct but Statement II is incorrect
(D)Statement I is incorrect but Statement II is correct

Q28·ChemistrySingle correctJEE Main 2022

Match List I with List II Choose the correct answer from the options given below :

List I (Pollutant)	List II (Source)
A.Microorganisms	I.Strip mining
B.Plant nutrients	II.Domestic sewage
C.Toxic heavy metals	III.Chemical fertilizer
D.Sediment	IV.Chemical factory

(A)A-II, B-III, C-IV, D-I
(B)A-II, B-I, C-IV, D-III
(C)A-I, B-IV, C-II, D-III
(D)A-I, B-IV, C-III, D-II

Q29·ChemistrySingle correctJEE Main 2022

\overset{\bullet}{\mathrm{C}}\mathrm{l}

+ CH

_4

→ A + B A and B in the above atmospheric reaction step are

(A)C $_2$ H $_6$ and Cl $_2$
(B) $\overset{\bullet}{\mathrm{C}}\mathrm{HCl}_2$ and H $_2$
(C) $\overset{\bullet}{\mathrm{C}}\mathrm{H}_3$ and HCl
(D)C $_2$ H $_6$ and HCl

Q30·ChemistrySingle correctJEE Main 2022

The photochemical smog does not generally contain :

(A)NO
(B) $NO_{2}$
(C) $SO_{2}$
(D)HCHO

Q31·ChemistrySingle correctJEE Main 2022

Sulphur dioxide is one of the components of polluted air. SO

_2

is also a major contributor to acid rain. The correct and complete reaction to represent acid rain caused by SO

_2

is :

(A)2 SO $_2$ + O $_2$ $\rightarrow$ 2 SO $_3$
(B)SO $_2$ + O $_3$ $\rightarrow$ SO $_3$ + O $_2$
(C)SO $_2$ + H $_2$ O $_2$ $\rightarrow$ H $_2$ SO $_4$
(D)2 SO $_2$ + O $_2$ + 2 H $_2$ O $\rightarrow$ 2 H $_2$ SO $_4$

Q32·ChemistrySingle correctJEE Main 2022

The acid that is believed to be mainly responsible for the damage of Taj Mahal is

(A)Sulfuric acid
(B)Hydrofluoric acid
(C)Phosphoric acid
(D)Hydrochloric acid

Q33·ChemistrySingle correctJEE Main 2022

Correct statement about photo-chemical smog is :

(A)It occurs in humid climate.
(B)It is a mixture of smoke, fog and SO $_2$
(C)It is reducing smog.
(D)It results from reaction of unsaturated hydrocarbons.

Q34·ChemistrySingle correctJEE Main 2022

Which amongst the following is not a pesticide ?

(A)DDT
(B)Organophosphates
(C)Dieldrin
(D)Sodium arsenite

Q35·ChemistrySingle correctJEE Main 2022

(A)Both Statement I and Statement II are correct
(B)Both Statement I and Statement II are incorrect
(C)Statement I is correct but statement II is incorrect
(D)Statement I is incorrect but Statement II is correct

Q36·ChemistrySingle correctJEE Main 2022

On the surface of polar stratospheric clouds, hydrolysis of chlorine nitrate gives A and B while its reaction with HCl produces B and C. A, B and C are, respectively

(A)HOCl, HNO $_3$ , Cl $_2$
(B)Cl $_2$ , HNO $_3$ , HOCl
(C)HClO $_2$ , HNO $_2$ , HOCl
(D)HOCl, HNO $_2$ , Cl $_2$ O

Q37·ChemistrySingle correctJEE Main 2022

Polar stratospheric clouds facilitate the formation of :

(A) $ClONO_{2}$
(B)HOCl
(C)ClO
(D) $CH_{4}$

Q38·ChemistrySingle correctJEE Main 2022

(A)A and B
(B)A and D
(C)B and C
(D)B and D

Q39·ChemistrySingle correctJEE Main 2022

The eutrophication of water body results in :

(A)loss of Biodiversity
(B)breakdown of organic matter
(C)increase in biodiversity
(D)decrease in BOD.

Q40·ChemistrySingle correctJEE Main 2022

(A)Both A and R are correct and R is the correct explanation of A.
(B)Both A and R are correct but R is NOT the correct explanation of A.
(C)A is correct but R is not correct.
(D)A is not correct but R is correct.

Q41·ChemistrySingle correctJEE Main 2022

Some gases are responsible for heating of atmosphere (green house effect). Identify from the following the gaseous species which does not cause it.

(A)CH $_4$
(B)O $_3$
(C)H $_2$ O
(D)N $_2$

Q42·ChemistrySingle correctJEE Main 2021

Water sample is called cleanest on the basis of which one of the BOD values given below

(A)11 ppm
(B)15 ppm
(C)3 ppm
(D)21 ppm

Q43·ChemistrySingle correctJEE Main 2021

BOD values (in ppm) for clean water (A) and polluted water (B) are expected respectively :

(A)A > 50, B < 27
(B)A > 25, B < 17
(C)A < 5, B > 17
(D)A > 15, B > 47

Q44·ChemistrySingle correctJEE Main 2021

The deposition of X and Y on ground surfaces is referred as wet and dry depositions, respectively. X and Y are :

(A)X = Ammonium salts, Y = $\mathrm{CO_2}$
(B)X = $\mathrm{SO_2}$ , Y = Ammonium salts
(C)X = Ammonium salts, Y = $\mathrm{SO_2}$
(D)X = $\mathrm{CO_2}$ , Y = $\mathrm{SO_2}$

Q45·ChemistrySingle correctJEE Main 2021

(A) $\mathrm{Cl}\dot{\mathrm{O}} + \dot{\mathrm{C}}\mathrm{F_2Cl}$
(B) $\mathrm{Cl}\dot{\mathrm{O}} + \dot{\mathrm{C}}\mathrm{H_3}$
(C) $\dot{\mathrm{C}}\mathrm{H_3} + \dot{\mathrm{C}}\mathrm{F_2Cl}$
(D) $\dot{\mathrm{C}}\mathrm{l} + \dot{\mathrm{C}}\mathrm{F_2Cl}$

Q46·ChemistrySingle correctJEE Main 2021

In stratosphere most of the ozone formation is assisted by :

(A)cosmic rays.
(B)γ–rays.
(C)ultraviolet radiation.
(D)visible radiations.

Q47·ChemistrySingle correctJEE Main 2021

(A)Both (A) and (R) are true but (R) is not the true explanation of (A)
(B)(A) is false but (R) is true.
(C)(A) is true but (R) is false
(D)Both (A) and (R) are true and (R) is the true explanation of (A)

Q48·ChemistrySingle correctJEE Main 2021

(A)(a) –(iv), (b) –(i), (c) – (iii), (d) – (ii)
(B)(a) – (i), (b) –(ii), (c) – (iii), (d) – (iv)
(C)(a) – (iii), (b) – (iv), (c) – (ii), (d) – (i)
(D)(a) – (iii), (b) – (iv), (c) – (i), (d) – (ii)

Q49·ChemistrySingle correctJEE Main 2021

Which one of the following statements is NOT correct?

(A)Eutrophication indicates that water body is polluted
(B)Eutrophication leads to increase in the oxygen level in water
(C)Eutrophication leads to anaerobic conditions
(D)The dissolved oxygen concentration below 6 ppm inhibits fish growth

Q50·ChemistrySingle correctJEE Main 2021

(A)Statement I is incorrect but Statement II is true
(B)Both Statement I and II are correct
(C)Both Statement I and II are false
(D)Statement I is correct but Statement II is false

Q51·ChemistrySingle correctJEE Main 2021

Which one of the following gases is reported to retard photosynthesis ?

(A) $\mathrm{CO_2}$
(B)CFCs
(C) $\mathrm{CO}$
(D) $\mathrm{NO_2}$

Q52·ChemistrySingle correctJEE Main 2021

Green chemistry in day- to day life is in the use of:

(A)Chlorine for bleaching of paper
(B)Large amount of water alone for washing clothes
(C)Liquified $CO_{2}$ for dry cleaning of clothes
(D)Tetrachloroethene for laundry

Q53·ChemistrySingle correctJEE Main 2021

The satements that are TRUE : (A) Methane leads to both global warming and photochemical smog (B) Methane is generated from paddy fields (C) Methane is a stronger global warming gas than CO

_{2}

(D) Methane is a part of reducing smog Choose the most appropriate answer from the options given below :

(A)(A), (B), (C) only
(B)(A) and (B) only
(C)(B), (C), (D) only
(D)(A), (B), (D) only

Q54·ChemistrySingle correctJEE Main 2021

(A)Both statement I and statement II are false
(B)Statement I is true but statement II is false
(C)Statement I is false but statement II is true
(D)Both statement I and statement II are true.

Q55·ChemistrySingle correctJEE Main 2021

(A)(A) only
(B)(C) only
(C)(B) and (D) only
(D)(D) only

Q56·ChemistrySingle correctJEE Main 2021

Reducing smog is a mixture of:

(A)Smoke, fog and $\mathrm{O_3}$
(B)Smoke, fog and $\mathrm{SO_2}$
(C)Smoke, fog and $\mathrm{CH_2{=}CH-CHO}$
(D)Smoke, fog and $\mathrm{N_2O_3}$

Q57·ChemistrySingle correctJEE Main 2021

The type of pollution that gets increased during the day time and in the presence of O

_{3}

is :

(A)Reducing smog
(B)Oxidising smog
(C)Global warming
(D)Acid rain

Q58·ChemistrySingle correctJEE Main 2021

The green house gas/es is (are) : (A) Carbon dioxide (B) Oxygen (C) Water vapour (D) Methane Choose the most appropriate answer from the options given below :

(A)(A) and (C) only
(B)(A) only
(C)(A), (C) and (D) only
(D)(A) and (B) only

Q59·ChemistrySingle correctJEE Main 2021

(A)Statement I and Statement II are true
(B)Statement I is true about Statement II is false
(C)Both Statement I and Statement II are false
(D)Statement I is false but Statement II is true

Q60·ChemistrySingle correctJEE Main 2021

(A)Statement I is false but Statement II is true
(B)Both statement I and statement II are true
(C)Both statement I and statement II are false
(D)Statement I is true but statement II is false

Q61·ChemistrySingle correctJEE Main 2021

The gas released during anaerobic degradation of vegetation may lead to:

(A)Global warming and cancer
(B)Acid rain
(C)Corrosion of metals
(D)Ozone hole

Q62·ChemistrySingle correctJEE Main 2021

(A)Both Statement I and Statement II are false
(B)Statement I is false but Statement II is true
(C)Statement I is true but Statement II is false
(D)Both Statement I and Statement II are true

Q63·ChemistrySingle correctJEE Main 2020

The present of soluble fluoride ion upto 1 ppm concentration in drinking water, is:

(A)harmful for teeth
(B)harmful to skin
(C)harmful to bones
(D)safe for teeth

Q64·ChemistrySingle correctJEE Main 2020

The condition that indicates a polluted environment is:

(A)0.03% of $CO_2$ in the atmosphere
(B)pH of rain water to be 5.6
(C)eutrophication
(D)BOD value of 5 ppm

Q65·ChemistrySingle correctJEE Main 2020

The processes of calcination and roasting in metallurgical industries, respectively, can lead to:

(A)Photochemical smog and global warming
(B)Global warming and photochemical smog
(C)Global warming and acid rain
(D)Photochemical smog and ozone layer depletion

Q66·ChemistrySingle correctJEE Main 2020

Thermal power plants can lead to:

(A)Ozone layer depletion
(B)Acid rain
(C)Blue baby syndrome
(D)Eutrophication

Q67·ChemistrySingle correctJEE Main 2020

(A)(a), (b) and (d)
(B)(c) and (d)
(C)(a), (c) and (d)
(D)(c) only

Q68·ChemistrySingle correctJEE Main 2020

Biochemical Oxygen Demand (BOD) is the amount of oxygen required (in ppm):

(A)for the photochemical breakdown of waste present in 1 m $^3$ volume of a water body.
(B)for sustaining life in a water body.
(C)by bacteria to break-down organic waste in a certain volume of a water sample.
(D)by anaerobic bacteria to breakdown inorganic waste present in a water body.

Q69·ChemistrySingle correctJEE Main 2019

The primary pollutant that leads to photochemical smog is:

(A)acrolein
(B)nitrogen oxides
(C)ozone
(D)sulphur dioxide

Q70·ChemistrySingle correctJEE Main 2019

The correct set of species responsible for the photochemical smog is :

(A)NO, NO $_2$ , O $_3$ and hydrocarbons
(B)CO $_2$ , NO $_2$ SO $_2$ and hydrocarbons
(C)N $_2$ , NO $_2$ and hydrocarbons
(D)N $_2$ , O $_2$ , O $_3$ and hydrocarbons

Q71·ChemistrySingle correctJEE Main 2019

The regions of the atmosphere, where clouds form and where we live, respectively, are:

(A)Troposphere and Stratosphere
(B)Troposphere and Troposphere
(C)Stratosphere and Stratosphere
(D)Stratosphere and Troposphere

Q72·ChemistrySingle correctJEE Main 2019

Air pollution that occurs in sunlight is:

(A)oxidising smog
(B)acid rain
(C)reducing smog
(D)fog

Q73·ChemistrySingle correctJEE Main 2019

Excessive release of

CO_2

into the atmosphere results in:

(A)formation of smog
(B)depletion of ozone
(C)global warming
(D)polar vortex

Q74·ChemistrySingle correctJEE Main 2019

The layer of atmosphere between 10 km to 50 km above the sea level is called as:

(A)troposphere
(B)mesosphere
(C)stratosphere
(D)thermosphere

Q75·ChemistrySingle correctJEE Main 2019

Which is wrong with respect to our responsibility as a human being to protect our environment?

(A)Restricting the use of vehicles
(B)Using plastic bags
(C)Setting up compost tin in gardens
(D)Avoiding the use of floodlighted facilities.

Q76·ChemistrySingle correctJEE Main 2019

The maximum prescribed concentration of copper in drinking water is:

(A)0.5 ppm
(B)3 ppm
(C)5 ppm
(D)0.05 ppm

Q77·ChemistrySingle correctJEE Main 2019

Assertion : Ozone is destroyed by CFCs in the upper stratosphere. Reason : Ozone holes increase the amount of UV radiation reaching the earth.

(A)Assertion and reason are incorrect
(B)Assertion is false, but the reason is correct
(C)Assertion and reasons are both correct, and the reason is the correct explanation for the assertion.
(D)Assertion and reason are correct, but the reason is not the explanation for the assertion.

Q78·ChemistrySingle correctJEE Main 2019

The molecules that has minimum/no role in the formation of photochemical smog is:

(A) $N_2$
(B) $CH_2=O$
(C) $O_3$
(D)NO

Q79·ChemistrySingle correctJEE Main 2019

The upper stratosphere consisting of the ozone layer protects us from the sun's radiation that falls in the wavelength region of :

(A)200 - 315 nm
(B)400 - 550 nm
(C)0.8 - 1.5 nm
(D)600 - 750 nm

Q80·ChemistrySingle correctJEE Main 2019

Water sample with BOD vales of 4 ppm and 18 ppm respectively are

(A)Clean and clean
(B)Highly polluted and clean
(C)Clean and highly polluted
(D)Highly polluted and highly polluted.

Q81·ChemistrySingle correctJEE Main 2019

The compound that is NOT a common component of photochemical smog is :

(A)O3
(B)H3C-C(=O)-OONO2
(C)CH2=CHCHO
(D)CF2Cl2

Q82·ChemistrySingle correctJEE Main 2019

The higher concentration of which gas in air can cause stiffness of flower buds?

(A)NO $_2$
(B)CO $_2$
(C)SO $_2$
(D)CO

Q83·ChemistrySingle correctJEE Main 2019

Peroxyacetyl nitrate (PAN), an eye irritant is produced by:

(A)classical smog
(B)acid rain
(C)organic waste
(D)photochemical smog

Q84·ChemistrySingle correctJEE Main 2019

The concentration of dissolved oxygen (DO) is cold water can go upto:

(A)14 ppm
(B)8 ppm
(C)10 ppm
(D)16 ppm

Q85·ChemistrySingle correctJEE Main 2019

Taj Mahal is being slowly disfigured and discoloured. This is primarily due to:

(A)global warming
(B)acid rain
(C)water pollution
(D)soil pollution

Q86·ChemistrySingle correctJEE Main 2019

Water filled in two glasses A and B have BOD values of 10 and 20 respectively. The correct statement regarding them is

(A)B is more polluted than A
(B)A is suitable for drinking, whereas B is not
(C)both A and B are suitable for drinking
(D)A is more polluted than B

Q87·ChemistrySingle correctJEE Main 2019

The pH of rain water is approximately

(A)5.6
(B)7.5
(C)7.0
(D)6.5

Q88·ChemistrySingle correctJEE Main 2019

A water sample has ppm level concentration of the following metals: Fe = 0.2, Mn = 5.0, Cu = 3.0, Zn = 5.0. The metal that makes the water sample unsuitable for drinking is

(A)Cu
(B)Mn
(C)Fe
(D)Zn

Q89·ChemistrySingle correctJEE Main 2019

Which of the following conditions in drinking water causes methemoglobinemia?

(A)> 50 ppm of lead
(B)> 50 ppm of chloride
(C)> 50 ppm of nitrate
(D)> 100 ppm of sulphate

Environmental Chemistry — frequently asked

How many questions from Environmental Chemistry appear in JEE?

Environmental Chemistry has appeared in 83 of the last 186 JEE Main and JEE Advanced papers — about 45% of them — contributing 89 questions in total across those papers.

Is Environmental Chemistry an important chapter for JEE?

Where do these Environmental Chemistry questions come from?

Every question is from an official JEE Main or JEE Advanced paper, transcribed from the original paper and tagged to this chapter. Answers follow the official answer key.