Is Classification of Elements and Periodicity in Properties an important chapter for JEE?

Judged by how often it is actually tested, it appears in roughly 61% 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.

Given below are two statements: Statement (I): The radii of isoelectronic species: Mg$^{2+}$ F > Br > I. In the light of the above statements, choose the most appropriate answer from the options given below:

(D) Both Statement I and Statement II are correct

(A) Statement I is incorrect but Statement II is correct

(B) Both Statement I and Statement II are incorrect

(C) Statement I is correct but Statement II is incorrect

Classification of Elements and Periodicity in Properties JEE Previous Year Questions with Answers

Q1·ChemistryMultiple correctJEE Advanced 2026

The correct statement(s) regarding the periodic properties of elements is(are)

(A)Second ionization enthalpy of carbon atom is less than that of boron atom.
(B)Increasing order of ionic radii: $Al^{3+} < Mg^{2+} < Na^{+}$
(C)Under identical conditions, in solid state, the density of potassium metal is more than density of sodium metal.
(D)The $H-H$ bond is weaker than $F-F$ bond.

Q2·ChemistrySingle correctJEE Main 2026

Match List-I (Electronic configuration of neutral atom, where

n = 2

) with List-II (1st Ionization Energy / kJ mol

^{-1}

). Choose the correct answer from the options given below:

List-I (Electronic configuration of neutral atom, where $n = 2$)	List-II (1st Ionization Energy / kJ mol$^{-1}$)
A. $ns^2$	I.2080
B. $ns^2np^1$	II.899
C. $ns^2np^3$	III.800
D. $ns^2np^6$	IV.1402

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

Q3·ChemistryNumericalJEE Main 2026

First and second ionization enthalpies of lithium are 520 kJ mol⁻¹ and 7297 kJ mol⁻¹ respectively. Energy required to convert 3.5 mg lithium (g) into Li²⁺(g) [Li(g) → Li²⁺(g)] is _______ kJ mol⁻¹. (nearest integer) [Molar mass of Li = 7 g mol⁻¹]

Q4·ChemistrySingle correctJEE Main 2026

In a period, the first ionisation enthalpy of the element at extreme left and the negative electron gain enthalpy of the extreme right element, except noble gases, are respectively.

(A)lowest and lowest
(B)highest and lowest
(C)lowest and highest
(D)highest and highest

Q5·ChemistrySingle correctJEE Main 2026

Given below are two statements: Statement I: The correct order of electronegativity of fluorine, oxygen and nitrogen is

F > O > N

. Statement II: The oxidation state of oxygen in OF

_2

is

+2

and in Na

_2

O is

-2

. In the light of the above statements, choose the correct 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

Q6·ChemistrySingle correctJEE Main 2026

Given below are two statements : Statement I: The number of pairs among [Al₂O₃, Cr₂O₃], [Cl₂O₇, Mn₂O₇], [Na₂O, V₂O₃] and [CO, N₂O] that contain oxides of same nature (acidic, basic, neutral or amphoteric) is 4. Statement II: Among Na₂O, Al₂O₃, CO and Cl₂O₇, the most basic and acidic oxides are Na₂O and Cl₂O₇, respectively. In the light of the above statements, choose the correct 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

Q7·ChemistrySingle correctJEE Main 2026

The covalent radii of atoms A and B are

r_A

and

r_B

, respectively. The covalent bond length and total length of AB molecule are respectively

(A) $(r_A + r_B),\ 2(r_A + r_B)$
(B) $\frac{1}{2}(r_A + r_B),\ (r_A + r_B)$
(C) $(r_A + r_B),\ (r_A + r_B)$
(D) $2(r_A + r_B),\ \frac{1}{2}(r_A + r_B)$

Q8·ChemistrySingle correctJEE Main 2026

The

1^{st}

ionization enthalpy for Mg is +737 kJ/mol. The most probable estimated value of the

2^{nd}

ionization enthalpy of Mg is ______.

(A)−906 kJ/mol
(B)−856 kJ/mol
(C)+1450 kJ/mol
(D)+590 kJ/mol

Q9·ChemistrySingle correctJEE Main 2026

A monoatomic anion

(A^-)

has 45 neutrons and 36 electrons. Atomic mass, group in the periodic table and physical state at room temperature of the element

(A)

respectively are

(A) $80, 17$ , liquid
(B) $81, 16$ , solid
(C) $80, 16$ , gas
(D) $81, 15$ , gas

Q10·ChemistrySingle correctJEE Main 2026

Given below are two statements : Statement (I) : The first ionisation enthalpy of the elements Na, Mg, Cl and Ar follows the order Na > Mg > Cl > Ar. Statement (II) : Among Ca, Al, Fe and B, the third ionisation enthalpy is very high for Ca. In the light of the above statements, choose the correct 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

Q11·ChemistrySingle correctJEE Main 2026

The correct set that contains all kinds (basic, acidic, amphoteric and neutral) of oxides is:

(A) $Na_2O$ , $K_2O$ , $Al_2O_3$ and $As_2O_3$
(B) $Al_2O_3$ , $As_2O_3$ , $CO$ and $NO$
(C) $K_2O$ , $Cl_2O_7$ , $As_2O_3$ and $NO$
(D) $Na_2O$ , $N_2O$ , $Al_2O_3$ and $CO$

Q12·ChemistrySingle correctJEE Main 2026

Consider the elements N, P, O, S, Cl and F. The number of valence electrons present in the elements with most and least metallic character from the above list is respectively.

(A)7 and 5
(B)5 and 6
(C)5 and 7
(D)6 and 7

Q13·ChemistrySingle correctJEE Main 2026

In period 4 of the periodic table, the elements with highest and lowest atomic radii are respectively.

(A)Na & Cl
(B)K & Se
(C)K & Br
(D)Rb & Br

Q14·ChemistrySingle correctJEE Main 2026

Given below are two statements : Statement I : K > Mg > Al > B is the correct order in terms of metallic character. Statement II : Atomic radius is always greater than the ionic radius for any element. In the light of the above statements, choose the correct 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 false but Statement II is true
(D)Statement I is true but Statement II is false

Q15·ChemistrySingle correctJEE Main 2026

The correct order of C, N, O and F in terms of second ionisation potential is

(A)F < N < C < O
(B)C < O < N < F
(C)C < N < F < O
(D)C < F < N < O

Q16·ChemistrySingle correctJEE Main 2026

Given below are two statements : Statement I : The second ionisation enthalpy of Na is larger than the corresponding ionisation enthalpy of Mg. Statement II : The ionic radius of O

^{2-}

is larger than that of F

^{-}

. In the light of the above statements, choose the correct 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 false but statement II is true
(D)Statement I is true but statement II is false

Q17·ChemistrySingle correctJEE Main 2026

The correct trend in the first ionization enthalpies of the elements in the 3

^{rd}

period of periodic table is:

(A)Al < Si < S < P < Cl
(B)Al < S < P < Si < Cl
(C)Si < S < Al < P < Cl
(D)S < Si < Al < P < Cl

Q18·ChemistrySingle correctJEE Main 2026

Given below are two statements : Statement-I : C < O < N < F is the correct order in terms of first ionization enthalpy values. Statement-II : S > Se > Te > Po > O is the correct order in terms of the magnitude of electron gain enthalpy values. In the light of the above statements, choose the correct answer from the options 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.

Q19·ChemistrySingle correctJEE Main 2026

A 'p'-block element (E) and hydrogen form a binary cation (EH

_x

)

^{+}

, while EH

_3

on treatment with K

_2

HgI

_4

in alkaline medium gives a precipitate of basic mercury(II)amido-iodine. Given below are first ionisation enthalpy values (kJ mol

^{-1}

) for first element each from group 13, 14, 15 and 16. Identify the correct first ionisation enthalpy value for element E.

(A)1312
(B)1086
(C)1402
(D)801

Q20·ChemistrySingle correctJEE Main 2026

Given below are two statements: Statement-I: The correct order in terms of atomic/ionic radii is

\text{Al} > \text{Mg} > \text{Mg}^{2+} > \text{Al}^{3+}

. Statement-II: The correct order in terms of the magnitude of electron gain enthalpy is

\text{Cl} > \text{Br} > \text{S} > \text{O}

. In the light of the above statements, choose the correct 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

Q21·ChemistrySingle correctJEE Main 2026

Which of the following represents the correct trend for the mentioned property ? A. F > P > S > B – Frist Ionization Energy B. Cl > F > S > P – Electron Affinity C. K > Al > Mg > B – Metallic character D.

K_2O > Na_2O > MgO > Al_2O_3

– Basic character Choose the correct answer from the option given below.

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

Q22·ChemistrySingle correctJEE Main 2025

The atomic number of the element from the following with lowest

1^{st}

ionisation enthalpy is:

(A) $32$
(B) $35$
(C) $87$
(D) $19$

Q23·ChemistrySingle correctJEE Main 2025

Choose the incorrect trend in the atomic radii (r) of the elements:

(A) $r_{Br}<r_K$
(B) $r_{Mg}<r_{Al}$
(C) $r_{Rb}<r_{Cs}$
(D) $r_{At}<r_{Cs}$

Q24·ChemistrySingle correctJEE Main 2025

Which of the following statements are correct? A. The process of the addition an electron to a neutral gaseous atom is always exothermic. B. The process of removing an electron from an isolated gaseous atom is always endothermic. C. The 1st ionization energy of the boron is less than that of the beryllium. D. The electronegativity of C is 2.5 in

CH_4

and

CCl_4

. E. Li is the most electropositive among elements of group I. Choose the correct answer from the options given below:

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

Q25·ChemistrySingle correctJEE Main 2025

Match the LIST-I (Family) with LIST-II (Symbol of Element). Choose the correct answer from the options given below:

LIST-I (Family)	LIST-II (Symbol of Element)
A.Pnicogen (group 15)	I.Ts
B.Chalcogen	II.Og
C.Halogen	III.Lv
D.Noble gas	IV.Mc

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

Q26·ChemistrySingle correctJEE Main 2025

Electronic configuration of four elements A, B, C and D are given below: (A)

1s^2 2s^2 2p^3

(B)

1s^2 2s^2 2p^4

(C)

1s^2 2s^2 2p^5

(D)

1s^2 2s^2 2p^2

. Which of the following is the correct order of increasing electronegativity (Pauling’s scale)?

(A) $A<D<B<C$
(B) $A<C<B<D$
(C) $A<B<C<D$
(D) $D<A<B<C$

Q27·ChemistrySingle correctJEE Main 2025

An element ‘E’ has the ionisation enthalpy value of 374 kJ mol

^{-1}

. ‘E’ reacts with elements A, B, C and D with electron gain enthalpy values of

-328

,

-349

,

-325

and

-295

kJ mol

^{-1}

, respectively. The correct order of the products EA, EB, EC and ED in terms of ionic character is:

(A)EB > EA > EC > ED
(B)ED > EC > EA > EB
(C)EA > EB > EC > ED
(D)ED > EC > EB > EA

Q28·ChemistrySingle correctJEE Main 2025

Given below are two statements: Statement (I): The radii of isoelectronic species: Mg

^{2+}

< Na

^{+}

< F

^{-}

< O

^{2-}

. Statement (II): The magnitude of electron gain enthalpy of halogens decreases in the order: Cl > F > Br > I. In the light of the above statements, choose the most appropriate answer from the options given below:

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

Q29·ChemistrySingle correctJEE Main 2025

The type of oxide formed by the element among Li, Na, Be, Mg, B and Al that has the least atomic radius is:

(A) $A_2O_3$
(B) $AO_2$
(C) $AO$
(D) $A_2O$

Q30·ChemistrySingle correctJEE Main 2025

Given below are two statements: Statement (I): According to the Law of Octaves, the elements were arranged in the increasing order of their atomic number. Statement (II): Meyer observed a periodically repeated pattern upon plotting physical properties of certain elements against their respective atomic numbers. In the light of the above statements, choose the correct answer from the options given below:

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

Q31·ChemistrySingle correctJEE Main 2025

The incorrect decreasing order of atomic radii is:

(A) $Mg>Al>C>O$
(B) $Al>B>N>F$
(C) $Be>Mg>Al>Si$
(D) $Si>P>Cl>F$

Q32·ChemistrySingle correctJEE Main 2025

The successive 5 ionisation energies of an element are 800, 2427, 3658, 25024 and 32824 kJ/mol, respectively. By using the above values predict the group in which the above element is present :

(A)Group 2
(B)Group 13
(C)Group 4
(D)Group 14

Q33·ChemistrySingle correctJEE Main 2025

Which of the following Statements are NOT true about the periodic table? A. The properties of elements are function of atomic weights. B. The properties of elements are function of atomic numbers. C. Elements having similar outer electronic configuration are arranged in same period. D. An element's location reflects the quantum numbers of the last filled orbital. E. The number of elements in a period is same as the number of atomic orbitals available in energy level that is being filled. Choose the correct answer from the options given below :

(A)A, C and E Only
(B)D and E Only
(C)A and E Only
(D)B, C and E Only

Q34·ChemistrySingle correctJEE Main 2025

Given below are two statements: Statement (I): The first ionization energy of Pb is greater than that of Sn. Statement (II): The first ionization energy of Ge is greater than that of Si. In the light of the above statements, choose the correct answer from the options given below :

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

Q35·ChemistrySingle correctJEE Main 2025

Given below are two statements about X-ray spectra of elements: Statement (I): A plot of

\sqrt{\nu}

(

\nu=

frequency of X-rays emitted) vs atomic mass is a straight line. Statement (II): A plot of

\nu

(

\nu=

frequency of X-rays emitted) vs atomic number is a straight line. In the light of the above statements choose the correct answer from the options given below:

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

Q36·ChemistrySingle correctJEE Main 2025

The element that does not belong to the same period of the remaining elements (modern periodic table) is:

(A)Palladium
(B)Iridium
(C)Osmium
(D)Platinum

Q37·ChemistrySingle correctJEE Main 2025

Given below are two statements: Statement (I): An element in the extreme left of the periodic table forms acidic oxides. Statement (II): Acid is formed during the reaction between water and oxide of a reactive element present in the extreme right of the periodic table. In the light of the above statements, choose the correct answer from the options given below:

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

Q38·ChemistrySingle correctJEE Main 2025

Match List-I (Increasing Order of Species) with List-II (Property). Choose the correct answer from the options given below:

List-I (Increasing Order of Species)	List-II (Property)
A.Al³⁺ < Mg²⁺ < Na⁺ < F⁻	I.Ionisation Enthalpy
B.B < C < O < N	II.Metallic character
C.B < Al < Mg < K	III.Electronegativity
D.Si < P < S < Cl	IV.Ionic radii

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

Q39·ChemistrySingle correctJEE Main 2025

Which of the following electronegativity orders is INCORRECT?

(A)Al < Mg < B < N
(B)Al < Si < C < N
(C)Mg < Be < B < N
(D)S < Cl < O < F

Q40·ChemistrySingle correctJEE Main 2024

Match List-I (Property) with List-II (Order). Choose the correct answer from the options given below:

List-I (Property)	List-II (Order)
A.Melting point [K]	I.Tl > In > Ga > Al > B
B.Ionic Radius [ $M^{3+}$ /pm]	II.B > Tl > Al > Ga > In
C. $\Delta_i H_1$ [kJ mol $^{-1}$ ]	III.Tl > In > Al > Ga > B
D.Atomic Radius [pm]	IV.B > Al > Tl > In > Ga

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

Q41·ChemistrySingle correctJEE Main 2024

Match List-I (pairs of elements) with List-II (their property in respective groups). Choose the correct answer from the options given below:

List-I (Elements)	List-II (Property in their respective groups)
A.Cl, S	I.Elements with highest electronegativity
B.Ge, As	II.Elements with largest atomic size
C.Fr, Ra	III.Elements which show properties of both metals and non-metals
D.F, O	IV.Elements with highest negative electron gain enthalpy

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

Q42·ChemistrySingle correctJEE Main 2024

The electron affinity values are negative for: A.

Be \rightarrow Be^{-}

, B.

N \rightarrow N^{-}

, C.

O \rightarrow O^{2-}

, D.

Na \rightarrow Na^{-}

, E.

Al \rightarrow Al^{-}

. Choose the most appropriate answer from the options given below:

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

Q43·ChemistrySingle correctJEE Main 2024

Given below are two statements: Statement I: The metallic radius of Na is 1.86 Å and the ionic radius of

\text{Na}^+

is lesser than 1.86 Å. Statement II: Ions are always smaller in size than the corresponding elements. In the light of the above statements, choose the correct answer from the options given below:

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

Q44·ChemistrySingle correctJEE Main 2024

The statement(s) that are correct about the species

\text{O}^{2-}

,

\text{F}^-

,

\text{Na}^+

and

\text{Mg}^{2+}

: (A) All are isoelectronic. (B) All have the same nuclear charge. (C)

\text{O}^{2-}

has the largest ionic radius. (D)

\text{Mg}^{2+}

has the smallest ionic radius. Choose the most appropriate answer from the options given below:

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

Q45·ChemistrySingle correctJEE Main 2024

The correct order of the first ionization enthalpy is

(A) $\text{Al}>\text{Ga}>\text{Tl}$
(B) $\text{Ga}>\text{Al}>\text{B}$
(C) $\text{B}>\text{Al}>\text{Ga}$
(D) $\text{Tl}>\text{Ga}>\text{Al}$

Q46·ChemistrySingle correctJEE Main 2024

The correct order of first ionization enthalpy values of the following elements is: (A) O (B) N (C) Be (D) F (E) B. Choose the correct answer from the options given below:

(A)B < D < C < E < A
(B)E < C < A < B < D
(C)C < E < A < B < D
(D)A < B < D < C < E

Q47·ChemistrySingle correctJEE Main 2024

Number of elements from the following that CANNOT form compounds with valencies which match with their respective group valencies is ___. B, C, N, S, O, F, P, Al, Si

(A) $7$
(B) $5$
(C) $6$
(D) $3$

Q48·ChemistrySingle correctJEE Main 2024

Given below are two statements: Statement I: The correct order of first ionization enthalpy values of Li, Na, F and Cl is

\text{Na}<\text{Li}<\text{Cl}<\text{F}

. Statement II: The correct order of negative electron gain enthalpy values of Li, Na, F and Cl is

\text{Na}<\text{Li}<\text{F}<\text{Cl}

. In the light of the above statements, choose the correct 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 false but Statement II is true
(D)Statement I is true but Statement II is false

Q49·ChemistrySingle correctJEE Main 2024

Given below are two statements: Statement (I): Both metal and non-metal exist in p and d-block elements. Statement (II): Non-metals have higher ionisation enthalpy and higher electronegativity than the metals. 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 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

Q50·ChemistrySingle correctJEE Main 2024

In case of isoelectronic species the size of

F^-

,

Ne

and

Na^+

is affected by:

(A)Principal quantum number (n) same
(B)None of the factors because their size is the same
(C)Electron-electron interaction in the outer orbitals
(D)Nuclear charge (z)

Q51·ChemistrySingle correctJEE Main 2024

Consider the following elements:

A'

and

B'

are adjacent elements in the same period (with

A'

to the left of

B'

), and

C'

and

D'

lie directly below

A'

and

B'

respectively in the next period. Which of the following is/are true about

A'

,

B'

,

C'

and

D'

? A. Order of atomic radii:

B'<A'<D'<C'

B. Order of metallic character:

B'<A'<D'<C'

C. Size of the element:

D'<C'<B'<A'

D. Order of ionic radii:

B'^+<A'^+<D'^+<C'^+

Choose the correct answer from the options given below:

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

Q52·ChemistrySingle correctJEE Main 2024

The correct sequence of electron gain enthalpy of the elements listed below is A. Ar B. Br C. F D. S Choose the most appropriate from the options given below:

(A)C > B > D > A
(B)A > D > B > C
(C)A > D > C > B
(D)D > C > B > A

Q53·ChemistrySingle correctJEE Main 2024

Given below are two statements: one is labeled as Assertion (A) and the other is labeled as Reason (R). Assertion (A): There is a considerable increase in covalent radius from N to P. However from As to Bi only a small increase in covalent radius is observed. Reason (R): covalent and ionic radii in a particular oxidation state increases down the group. In the light of the above statement, choose the most appropriate answer from the options given below:

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

Q54·ChemistryNumericalJEE Main 2024

If IUPAC name of an element is "Unununnium" then the element belongs to

n^{th}

group of periodic table. The value of

n

is ___

Q55·ChemistrySingle correctJEE Main 2024

Given below are two statements: Statement-I: Along the period, the chemical reactivity of the element gradually increases from group 1 to group 18. Statement-II: The nature of oxides formed by group 1 element is basic while that of group 17 elements is acidic. 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)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 false.

Q56·ChemistrySingle correctJEE Main 2024

The element having the highest first ionization enthalpy is:

(A)Si
(B)Al
(C)N
(D)C

Q57·ChemistrySingle correctJEE Main 2024

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R : Assertion A : The first ionisation enthalpy decreases across a period. Reason R : The increasing nuclear charge outweighs the shielding across the period. In the light of the above statements, choose the most appropriate from the options given below :

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

Q58·ChemistrySingle correctJEE Main 2024

Given below are two statements: Statement I: Fluorine has most negative electron gain enthalpy in its group. Statement II: Oxygen has least negative electron gain enthalpy in its group. In the light of the above statements, choose the most appropriate from the options given below.

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

Q59·ChemistrySingle correctJEE Main 2024

Statement (I): The 4f-series and 5f-series of elements are placed separately in the Periodic table to preserve the principle of classification. Statement (II): S-block elements can be found in pure form in nature. In the light of the above statements, choose the most appropriate answer from the options given below:

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

Q60·ChemistrySingle correctJEE Main 2023

Which of the following statements are not correct? A. The electron gain enthalpy of

F

is more negative than that of

Cl

B. Ionization enthalpy decreases in a group of periodic table C. The electronegativity of an atom depends upon the atoms bonded to it D.

Al_{2}O_{3}

and

NO

are examples of amphoteric oxides. Choose the most appropriate answer from the options given below:

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

Q61·ChemistryAssertion & ReasonJEE Main 2023

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: The energy required to form

\text{Mg}^{2+}

from Mg is much higher than that required to produce

\text{Mg}^{+}

. Reason R:

\text{Mg}^{2+}

is a small ion and carries more charge than

\text{Mg}^{+}

. In the light of the above statements, choose the correct answer from the options given below:

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

Q62·ChemistrySingle correctJEE Main 2023

The correct order of metallic character is:

(A) $\text{Be}>\text{Ca}>\text{K}$
(B) $\text{Ca}>\text{K}>\text{Be}$
(C) $\text{K}>\text{Ca}>\text{Be}$
(D) $\text{K}>\text{Be}>\text{Ca}$

Q63·ChemistrySingle correctJEE Main 2023

The difference between electron gain enthalpies will be maximum between:

(A)Ne and F
(B)Ne and Cl
(C)Cl and F
(D)F and Cl

Q64·ChemistrySingle correctJEE Main 2023

For electron gain enthalpies of the elements denoted as

\Delta_{eg}H

, the incorrect option is:

(A) $\Delta_{eg}H(Te)<\Delta_{eg}H(Po)$
(B) $\Delta_{eg}H(Se)<\Delta_{eg}H(S)$
(C) $\Delta_{eg}H(Cl)<\Delta_{eg}H(F)$
(D) $\Delta_{eg}H(I)<\Delta_{eg}H(At)$

Q65·ChemistrySingle correctJEE Main 2023

Match List I (atomic number) with List II (block of periodic table). Choose the correct answer from the options given below:

List I (Atomic number)	List II (Block of periodic table)
A.37	I.p-block
B.78	II.d-block
C.52	III.f-block
D.65	IV.s-block

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

Q66·ChemistrySingle correctJEE Main 2022

The first ionization enthalpy of Na, Mg and Si, respectively, are: 496, 737 and 786 kJ mo1

^{-1}

. The first ionization enthalpy (kJ mol

^{-1}

) of Al is:

(A)487
(B)768
(C)577
(D)856

Q67·ChemistrySingle correctJEE Main 2022

The correct decreasing order for metallic character is

(A) $\mathrm{Na > Mg > Be > Si > P}$
(B) $\mathrm{P > Si > Be > Mg > Na}$
(C) $\mathrm{Si > P > Be > Na > Mg}$
(D) $\mathrm{Be > Na > Mg > Si > P}$

Q68·ChemistrySingle correctJEE Main 2022

In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical ? (A) Rb and Cs (B) Na and K (C) Ar and Kr (D) I and At Choose the correct answer from the options given below :

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

Q69·ChemistrySingle correctJEE Main 2022

The incorrect statement is

(A)The first ionization enthalpy of K is less than that of Na and Li
(B)Xe does not have the lowest first ionization enthalpy in its group
(C)The first ionization enthalpy of element with atomic number 37 is lower than that of the element with atomic number 38.
(D)The first ionization enthalpy of Ga is higher than that of the d-block element with atomic number 30.

Q70·ChemistrySingle correctJEE Main 2022

Outermost electronic configurations of four elements A, B, C, D are given below: (A)

3s^{2}

(B)

3s^{2}3p^{1}

(C)

3s^{2}3p^{3}

(D)

3s^{2}3p^{4}

The correct order of first ionization enthalpy for them is:

(A)(A) < (B) < (C) < (D)
(B)(B) < (A) < (D) < (C)
(C)(B) < (D) < (A) < (C)
(D)(B) < (A) < (C) < (D)

Q71·ChemistrySingle correctJEE Main 2022

Given two statements below : Statement I : In Cl

_2

molecule the covalent radius is double of the atomic radius of chlorine. Statement II : Radius of anionic species is always greater than their parent atomic radius. Choose the most appropriate answer from 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.

Q72·ChemistrySingle correctJEE Main 2022

The IUPAC nomenclature of an element with electronic configuration

[Rn]5f^{14}6d^{1}7s^{2}

is :

(A)Unnilbium
(B)Unnilunium
(C)Unnilquadium
(D)Unniltrium

Q73·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 : The first ionization enthalpy for oxygen is lower than that of nitrogen. Reason R : The four electrons in 2p orbitals of oxygen experience more electron-electron repulsion. In the light of the above statements, choose the correct 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

Q74·ChemistrySingle correctJEE Main 2022

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

List-I (Oxide)	List-II (Nature)
A.Cl $_2$ O $_7$	I.Amphoteric
B.Na $_2$ O	II.Basic
C.Al $_2$ O $_3$	III.Neutral
D.N $_2$ O	IV.Acidic

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

Q75·ChemistrySingle correctJEE Main 2022

Element "E" belongs to the period 4 and group 16 of the periodic table. The valence shell electron configuration of the element, which is just above ‘E’ in the group is

(A) $3s^2. 3p^4$
(B) $3d^{10}. 4s^2, 4p^4$
(C) $4d^{10}. 5s^2, 5p^4$
(D) $2s^2$ , p4

Q76·ChemistrySingle correctJEE Main 2022

Among the following basic oxide is :

(A)SO $_3$
(B)SiO $_2$
(C)CaO
(D)Al $_2$ O $_3$

Q77·ChemistrySingle correctJEE Main 2022

The correct order of increasing ionic radii is

(A)Mg $^{2+}$ < Na $^{+}$ < F $^{-}$ < O $^{2-}$ < N $^{3-}$
(B)N $^{3-}$ < O $^{2-}$ < F $^{-}$ < Na $^{+}$ < Mg $^{2+}$
(C)F $^{-}$ < Na $^{+}$ < O $^{2-}$ < Mg $^{2+}$ < N $^{3-}$
(D)Na $^{+}$ < F $^{-}$ < Mg $^{2+}$ < O $^{2-}$ < N $^{3-}$

Q78·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): The ionic radii of

O^{2-}

and

Mg^{2+}

are same. Reason (R) : Both

O^{2-}

and

Mg^{2+}

are isoelectronic species In the light of the above statements, choose the correct answer from the options given below

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

Q79·ChemistrySingle correctJEE Main 2022

Which of the following elements in considered as a metalloid?

(A)Sc
(B)Pb
(C)Bi
(D)Te

Q80·ChemistrySingle correctJEE Main 2022

The pair, in which ions are isoelectronic with

Al^{3+}

is :-

(A) $Br^-$ and $Be^{2+}$
(B) $Cl^-$ and $Li^+$
(C) $S^{2-}$ and $K^+$
(D) $O^{2-}$ and $Mg^{2+}$

Q81·ChemistrySingle correctJEE Main 2022

The correct order of electron gain enthalpies of Cl, F, Te and Po is

(A)F < Cl < Te < Po
(B)Po < Te < F < Cl
(C)Te < Po < Cl < F
(D)Cl < F < Te < Po

Q82·ChemistrySingle correctJEE Main 2022

Metals generally melt at very high temperature. Amongst the following, the metal with the highest melting point will be

(A)Hg
(B)Ag
(C)Ga
(D)Cs

Q83·ChemistrySingle correctJEE Main 2022

Given below are the oxides: Na

_2

O, As

_2

O

_3

, N

_2

O, NO and Cl

_2

O

_7

Number of amphoteric oxides is:

(A)0
(B)1
(C)2
(D)3

Q84·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) : Metallic character decreases and non-metallic character increases on moving from left to right in a period. Reason (R) : It is due to increase in ionisation enthalpy and decrease in electron gain enthalpy, when one moves from left to right in a period. In the light of the above statements, choose the most appropriate answer from the options given below :

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

Q85·ChemistrySingle correctJEE Main 2021

The correct order of ionic radii for the ions, P

^{3-}

, S

^{2-}

, Ca

^{2+}

, K

^{+}

, Cl

^{-}

is :

(A)P $^{3-}$ > S $^{2-}$ > Cl $^{-}$ > K $^{+}$ > Ca $^{2+}$
(B)Cl $^{-}$ > S $^{2-}$ > P $^{3-}$ > Ca $^{2+}$ > K $^{+}$
(C)P $^{3-}$ > S $^{2-}$ > Cl $^{-}$ > Ca $^{2+}$ > K $^{+}$
(D)K $^{+}$ > Ca $^{2+}$ > P $^{3-}$ > S $^{2-}$ > Cl $^{-}$

Q86·ChemistrySingle correctJEE Main 2021

The CORRECT order of first ionisation enthalpy is:

(A)Mg < Al < S < P
(B)Al < Mg < S< P
(C)Mg < S < Al < P
(D)Mg < Al < P < S

Q87·ChemistrySingle correctJEE Main 2021

The ionic radii of

K^{+},Na^{+},Al^{3+}

and

Mg^{2+}

are in the order:

(A) $K^{+} < Al^{3+} < Mg^{2+} < Na^{+}$
(B) $Al^{3+} < Mg^{2+} < K^{+} < Na^{+}$
(C) $Al^{3+} < Mg^{2+} < Na^{+} < K^{+}$
(D) $Na^{+} < K^{+} < Mg^{2+} < Al^{3+}$

Q88·ChemistrySingle correctJEE Main 2021

The ionic radii of

F^{-}

and

O^{2-}

respectively are 1.33 Å and 1.4 Å, while the covalent radius of N is 0.74 Å. The correct statement for the ionic radius of

N^{3-}

from the following is:

(A)It is smaller than $O^{2-}$ and $F^{-}$ , but bigger than of N
(B)It is bigger than $F^{-}$ and N, but smaller than of $O^{2-}$
(C)It is smaller than $F^{-}$ and N
(D)It is bigger than $O^{2-}$ and $F^{-}$

Q89·ChemistryNumericalJEE Main 2021

Number of electrons that Vanadium

(Z = 23)

has in p-orbitals is equal to ----------.

Q90·ChemistrySingle correctJEE Main 2021

Which one of the following statements for D.I. Mendeleeff, is incorrect?

(A)At the time, he proposed periodic table of elements structure of atom was known.
(B)Element with atomic number 101 is named after him.
(C)He invented accurate barometer.
(D)He authored the textbook − Principles of Chemistry.

Q91·ChemistrySingle correctJEE Main 2021

Outermost electronic configuration of a group 13 element, E, is

\mathrm{4s^2, 4p^1}

. The electronic configuration of an element of p-block period-five placed diagonally to element, E is:

(A) $\mathrm{[Kr]4d^{10}\,5s^2\,5p^2}$
(B) $\mathrm{[Kr]3d^{10}\,4s^2\,4p^2}$
(C) $\mathrm{[Xe]5d^{10}\,6s^2\,6p^2}$
(D) $\mathrm{[Ar]3d^{10}\,4s^2\,4p^2}$

Q92·ChemistrySingle correctJEE Main 2021

The first ionization energy of magnesium is smaller as compared to that of elements X and Y, but higher than that of Z. the elements X, Y and Z, respectively, are :

(A)chlorine, lithium and sodium
(B)argon, lithium and sodium
(C)argon, chlorine and sodium
(D)neon, sodium and chlorine

Q93·ChemistrySingle correctJEE Main 2021

The ionic radius of Na

^{+}

ions is 1.02 Å. The ionic radii (in Å) of Mg

^{2+}

and Al

^{3+}

, respectively, are-

(A)1.05 and 0.99
(B)0.72 and 0.54
(C)0.85 and 0.99
(D)0.68 and 0.72

Q94·ChemistrySingle correctJEE Main 2021

The set of elements that differ in mutual relationship from those of the other sets is :

(A)Li – Mg
(B)B – Si
(C)Be – Al
(D)Li – Na

Q95·ChemistrySingle correctJEE Main 2021

The absolute value of the electron gain enthalpy of halogens satisfies:

(A) $\mathrm{I > Br > Cl > F}$
(B) $\mathrm{Cl > Br > F > I}$
(C) $\mathrm{Cl > F > Br > I}$
(D) $\mathrm{F > Cl > Br > I}$

Q96·ChemistrySingle correctJEE Main 2021

Identify the elements X and Y using the ionisation energy values given below : Ionization energy (kJ/mol) 1

^{st}

2

^{nd}

X 495 4563 Y 731 1450

(A)X = Na ; Y = Mg
(B)X = Mg ; Y = F
(C)X = Mg ; Y = Na
(D)X = F ; Y = Mg

Q97·ChemistrySingle correctJEE Main 2021

The characteristics of elements X, Y and Z with atomic numbers, respectively, 33, 53 and 83 are :

(A)X and Y are metalloids and Z is a metal.
(B)X is a metalloid, Y is a non-metal and Z is a metal.
(C)X, Y and Z are metals.
(D)X and Z are non-metals and Y is a metalloid

Q98·ChemistrySingle correctJEE Main 2021

Match List-I with List-II. List –I : Electronic configuration of elements List-II : Δ

_i

H in kJ mol

^{-1}

(a) 1s

^2

2s

^2

— (i) 801 (b) 1s

^2

2s

^2

2p

^4

— (ii) 899 (c) 1s

^2

2s

^2

2p

^3

— (iii) 1314 (d) 1s

^2

2s

^2

2p

^1

— (iv) 1402

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

Q99·ChemistrySingle correctJEE Main 2021

The correct order of electron gain enthalpy is:

(A)S > Se > Te > O
(B)O > S > Se > Te
(C)S > O > Se > Te
(D)Te > Se > S > O

Q100·ChemistrySingle correctJEE Main 2021

Consider the elements Mg, Al, S, P and Si, the correct increasing order of their first ionization enthalpy is:

(A)Al < Mg < Si < S < P
(B)Al < Mg < S < Si < P
(C)Mg < Al < Si < S < P
(D)Mg < Al < Si < P < S

Q101·ChemistryIntegerJEE Advanced 2020

The 1

^{st}

, 2

^{nd}

and the 3

^{rd}

ionization enthalpies,

I_{1}

,

I_{2}

and

I_{3}

, of four atoms with atomic numbers n, n+1, n+2 and n+3, where n < 10, are tabulated below. What is the value of n?

Atomic number	$I_{1}$ (kJ/mol)	$I_{2}$ (kJ/mol)	$I_{3}$ (kJ/mol)
n	1681	3374	6050
n + 1	2081	3952	6122
n + 2	496	4562	6910
n + 3	738	1451	7733

Q102·ChemistryNumericalJEE Main 2020

The atomic number of Unnilunium is __________.

Q103·ChemistrySingle correctJEE Main 2020

The ionic radii of

\mathrm{O^{2-}}

,

\mathrm{F^-}

,

\mathrm{Na^+}

and

\mathrm{Mg^{2+}}

are in the order:

(A) $\mathrm{O^{2-}} > \mathrm{F^-} > \mathrm{Mg^{2+}} > \mathrm{Na^+}$
(B) $\mathrm{Mg^{2+}} > \mathrm{Na^+} > \mathrm{F^-} > \mathrm{O^{2-}}$
(C) $\mathrm{F^-} > \mathrm{O^{2-}} > \mathrm{Na^+} > \mathrm{Mg^{2+}}$
(D) $\mathrm{O^{2-}} > \mathrm{F^-} > \mathrm{Na^+} > \mathrm{Mg^{2+}}$

Q104·ChemistrySingle correctJEE Main 2020

The elements with atomic numbers 101 and 104 belong to, respectively:

(A)Actinoids and Group 6
(B)Actinoids and Group 4
(C)Group 11 and Group 4
(D)Group 6 and Actinoids

Q105·ChemistrySingle correctJEE Main 2020

The process that is NOT endothermic in nature is:

(A) $H_{(g)} + e^- \rightarrow H^-_{(g)}$
(B) $O^-_{(g)} + e^- \rightarrow O^{2-}_{(g)}$
(C) $Na_{(g)} \rightarrow Na^+_{(g)} + e^-$
(D) $Ar_{(g)} + e^- \rightarrow Ar^-_{(g)}$

Q106·ChemistrySingle correctJEE Main 2020

The atomic number of the element unnilennium is

(A)102
(B)108
(C)119
(D)109

Q107·ChemistrySingle correctJEE Main 2020

The five successive ionization enthalpies of an element are 800, 2427, 3658, 25024 and 32824 kJ mol

^{-1}

. The number of valence electrons in the element is:

(A)4
(B)2
(C)5
(D)3

Q108·ChemistrySingle correctJEE Main 2020

The acidic, basic and amphoteric oxides, respectively, are:

(A)Cl $_2$ O, CaO, P $_4$ O $_{10}$
(B)MgO, Cl $_2$ O, Al $_2$ O $_3$
(C)Na $_2$ O, SO $_3$ , Al $_2$ O $_3$
(D)N $_2$ O $_3$ , Li $_2$ O, Al $_2$ O $_3$

Q109·ChemistrySingle correctJEE Main 2020

The first and second ionisation enthalpies of a metal are 496 and 4560 kJ mol

^{-1}

, respectively. How many moles of HCl and H

_2

SO

_4

, respectively, will be needed to react completely with 1 mole of the metal hydroxide ?

(A)1 and 1
(B)1 and 2
(C)2 and 0.5
(D)1 and 0.5

Q110·ChemistrySingle correctJEE Main 2020

B has a smaller first ionization enthalpy than Be. Consider the following statements: (i) it is easier to remove 2p electron than 2s electron. (ii) 2p electron of B is more shielded from the nucleus by the inner core of electrons than the 2s electrons of Be. (iii) 2s electron has more penetration power than 2p electron (iv) atomic radius of B is more than Be (atomic number B = 5, Be = 4) The correct statements are:

(A)(i), (iii) and (iv)
(B)(i), (ii) and (iii)
(C)(i), (ii) and (iv)
(D)(ii), (iii) and (iv)

Q111·ChemistrySingle correctJEE Main 2020

The increasing order of the atomic radii of the following elements is: (a) C (b) O (c) F (d) Cl (e) Br

(A)(a) < (b) < (c) < (d) < (e)
(B)(d) < (c) < (b) < (a) < (e)
(C)(c) < (b) < (a) < (d) < (e)
(D)(b) < (c) < (d) < (a) < (e)

Q112·ChemistrySingle correctJEE Main 2020

The first ionization energy (in kJ/mol) of Na, Mg, Al and Si respectively, are :

(A)496, 577, 786, 737
(B)786, 737, 577, 496
(C)496, 577, 737, 786
(D)496, 737, 577, 786

Q113·ChemistrySingle correctJEE Main 2020

The order of electron gain enthalpy in kJ/mol of fluorine, chlorine, bromine and iodine, respectively are

(A)-333, -325, -349 and -296
(B)-333, -349, -325 and -296
(C)-349, -333, -325 and -296
(D)-296, -325, -333 and -349

Q114·ChemistrySingle correctJEE Main 2020

The atomic radius of Ag is closest to

(A)Ni
(B)Cu
(C)Au
(D)Hg

Q115·ChemistrySingle correctJEE Main 2020

Within each pair of elements F & Cl, S & Se and Li & Na, respectively, the elements that release more energy upon an electron gain are

(A)F, Se and Na
(B)Cl, Se and Na
(C)F, S and Li
(D)Cl, S and Li

Q116·ChemistrySingle correctJEE Main 2019

In comparison to boron, berylium has:

(A)greater nuclear charge and greater first ionisation enthalpy
(B)lesser nuclear charge and lesser first ionisation enthalpy
(C)greater nuclear charge and lesser first ionisation enthalpy
(D)lesser nuclear charge and greater first ionisation enthalpy

Q117·ChemistrySingle correctJEE Main 2019

The group number, number of valence electrons and valency of an element with atomic number 15, respectively, are:

(A)15, 5 and 3
(B)15, 6 and 2
(C)16, 5 and 2
(D)16, 6 and 3

Q118·ChemistrySingle correctJEE Main 2019

The isoelectronic set of ions is

(A)Li $^+$ , Na $^+$ , O $^{2-}$ and F $^-$
(B)F $^-$ , Li $^+$ , Na $^+$ and Mg $^{2+}$
(C)N $^{3-}$ , O $^{2-}$ , F $^-$ and Na $^+$
(D)N $^{3-}$ , Li $^+$ , Mg $^{2+}$ and O $^{2-}$

Q119·ChemistrySingle correctJEE Main 2019

The element having greatest difference between its first and second ionization energies, is

(A)Ca
(B)K
(C)Ba
(D)Sc

Q120·ChemistrySingle correctJEE Main 2019

The size of the iso-electronic species

Cl^-

, Ar and

Ca^{2+}

is affected by

(A)Principal quantum number of valence shell
(B)Azimuthal quantum number of valence shell
(C)electron – electron interaction in the outer orbitals
(D)nuclear charge

Q121·ChemistrySingle correctJEE Main 2019

The IUPAC symbols for the element with atomic number 119 would be:

(A)uun
(B)uue
(C)unh
(D)une

Q122·ChemistrySingle correctJEE Main 2019

The element with Z = 120 (not yet discovered) will be an/a

(A)Inner transition metal
(B)Alkaline earth metal
(C)Alkali metal
(D)Transition metal

Q123·ChemistrySingle correctJEE Main 2019

The correct option with respect to the Pauling electronegativity values of the elements is:

(A)Te > Xe
(B)Ga > Ge
(C)Si > Al
(D)P > S

Q124·ChemistrySingle correctJEE Main 2019

The correct order of the atomic radii of C, Cs, Al and S is:

(A)C < S < Al < Cs
(B)S < C < Cs < Al
(C)S < C < Al, Cs
(D)C < S < Cs < Al

Q125·ChemistrySingle correctJEE Main 2019

The electronegativity of aluminium is similar to

(A)carbon
(B)beryllium
(C)boron
(D)lithium

Q126·ChemistrySingle correctJEE Main 2019

In general, the properties that decrease and increase down a group in the periodic table respectively are

(A)atomic radius and electronegativity
(B)electron gain enthalpy and electronegativity
(C)electronegativity and atomic radius
(D)electronegativity and electron gain enthalpy

Q127·ChemistrySingle correctJEE Main 2019

When the first electron gain enthalpy (

\Delta_{eg}

H) of oxygen is -141 kJ/mol, its second electron gain enthalpy is

(A)a more negative value than the first
(B)almost the same as that of the first
(C)negative, but less negative than the first
(D)a positive value

Q128·ChemistryMultiple correctJEE Advanced 2017

The option(s) with only amphoteric oxides is(are)

(A) $\mathrm{Cr_{2}O_{3}}$ , BeO, SnO, $\mathrm{SnO_{2}}$
(B) $\mathrm{Cr_{2}O_{3}}$ , CrO, SnO, PbO
(C)NO, $\mathrm{B_{2}O_{3}}$ , PbO, $\mathrm{SnO_{2}}$
(D)ZnO, $\mathrm{Al_{2}O_{3}}$ , PbO, $\mathrm{PbO_{2}}$

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