Principles of Qualitative Analysis — JEE Previous Year Questions

Every Principles of Qualitative Analysis question asked in JEE Main and JEE Advanced across the last 186 papers — 62 questions, each with its correct answer. Free to read, no account needed.

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All 62 Principles of Qualitative Analysis questions

Most recent papers first.

Q1·ChemistrySingle correctJEE Main 2026

A paper dipped in a dil. H₂SO₄ solution of 'X' upon treatment with SO₂ gas turns into green. The compound 'X' is :

(A)KI-starch
(B)KMnO₄
(C)Pb(CH₃COO)₂
(D)K₂Cr₂O₇

Q2·ChemistrySingle correctJEE Main 2026

Among

\mathrm{Fe^{3+}}

\mathrm{Pb^{2+}}

\mathrm{Cu^{2+}}

and

\mathrm{Mn^{2+}}

, identify the one that gets precipitated out while passing

\mathrm{H_{2}S}

in presence of

\mathrm{NH_{4}OH}

as group reagent. The highest possible oxidation state of the corresponding metal is

(A)+3
(B)+4
(C)+2
(D)+7

Q3·ChemistrySingle correctJEE Main 2026

A salt with few drops of conc. HCl gives apple green colour in flame test. The group precipitate of the salt is dissolved in acetic acid and treated with

\mathrm{K_{2}CrO_{4}}

to give yellow precipitate. When the sodium carbonate extract of the salt solution is heated with conc.

\mathrm{HNO_{3}}

and ammonium molybdate, it resulted a canary yellow precipitate. The cation and anion present in the salt are respectively,

(A) $\mathrm{Ca}^{2+}$ and $\mathrm{SO_{4}^{2-}}$
(B) $\mathrm{Ba}^{2+}$ and $\mathrm{PO_{4}^{3-}}$
(C) $\mathrm{Mn}^{2+}$ and $\mathrm{PO_{4}^{3-}}$
(D) $\mathrm{Ba}^{2+}$ and $\mathrm{SO_{4}^{2-}}$

Q4·ChemistrySingle correctJEE Main 2026

Given below are two statements: Statement I: Griss–Ilosvay test is used for the detection of nitrite ion, which involves the use of sulphanilic acid and α–naphthylamine reagent. Statement II: In the above test, sulphanilic acid is diazotized by the acidified nitrite ion, which on further coupling with α–naphthylamine forms an azo-dye. 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

Q5·ChemistrySingle correctJEE Main 2026

Consider three metal chlorides x, y and z, where x is water soluble at room temperature, y is sparingly soluble in water at room temperature and z is soluble in hot water. x, y and z are respectively

(A) $MgCl_2$ , AgCl and $AlCl_3$
(B)AgCl, $Hg_2Cl_2$ and $PbCl_2$
(C) $AlCl_3$ , $PbCl_2$ and $BaCl_2$
(D) $CuCl_2$ , AgCl and $PbCl_2$

Q6·ChemistrySingle correctJEE Main 2026

In the Group analysis of cations ,

\text{Ba}^{2+}

\text{Ca}^{2+}

are precipitated respectively as

(A)sulphide & sulphide
(B)hydroxide & carbonate
(C)carbonate & carbonate
(D)chromate & sulphide

Q7·ChemistrySingle correctJEE Advanced 2025

The correct match of the group reagents in List-I for precipitating the metal ion given in List-II from solutions, is

List-I	List-II
P.Passing $H_2S$ in the presence of $NH_4OH$	1. $Cu^{2+}$
Q. $(NH_4)_2CO_3$ in the presence of $NH_4OH$	2. $Al^{3+}$
R. $NH_4OH$ in the presence of $NH_4Cl$	3. $Mn^{2+}$
S.Passing $H_2S$ in the presence of dilute HCl	4. $Ba^{2+}$
	5. $Mg^{2+}$

(A)P → 3; Q → 4; R → 2: S → 1
(B)P → 4; Q → 2; R → 3: S → 1
(C)P → 3; Q → 4; R → 1: S → 5
(D)P → 5; Q → 3; R → 2: S → 4

Q8·ChemistrySingle correctJEE Advanced 2025

During sodium nitroprusside test of sulphide ion in an aqueous solution, one of the ligands coordinated to the metal ion is converted to

(A)NOS $^{-}$
(B)SCN $^{-}$
(C)SNO $^{-}$
(D)NCS $^{-}$

Q9·ChemistrySingle correctJEE Main 2025

When a salt is treated with sodium hydroxide solution it gives gas X. On passing the gas X through reagent Y a brown coloured precipitate is formed. X and Y respectively, are:

(A)X = NH $_3$ and Y = HgO
(B)X = NH $_3$ and Y = K $_2$ HgI $_4$ + KOH
(C)X = NH $_4$ Cl and Y = KOH
(D)X = HCl and Y = NH $_4$ Cl

Q10·ChemistrySingle correctJEE Main 2025

Formation of

Na_4[Fe(CN)_5NOS]

, a purple coloured complex formed by addition of sodium nitroprusside in sodium carbonate extract of salt, indicates the presence of:

(A)Sodium ion
(B)Sulphate ion
(C)Sulphide ion
(D)Sulphite ion

Q11·ChemistrySingle correctJEE Main 2025

Choose the correct tests with their respective observations. (A)

CuSO_4

(acidified with acetic acid)

+\,K_4[Fe(CN)_6]\to

Chocolate brown precipitate. (B)

FeCl_3+K_4[Fe(CN)_6]\to

Prussian blue precipitate. (C)

ZnCl_2+K_4[Fe(CN)_6]

, neutralised with

NH_4OH\to

White or bluish white precipitate. (D)

MgCl_2+K_4[Fe(CN)_6]\to

Blue precipitate. (E)

BaCl_2+K_4[Fe(CN)_6]

, neutralised with

NaOH\to

White precipitate. Choose the correct answer from the options given below:

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

Q12·ChemistrySingle correctJEE Main 2025

Find the compound "A" from the following reaction sequences.

A\xrightarrow{\text{aqua-regia}}B\xrightarrow{\text{(1) }KNO_3/NH_4OH,\ \text{(2) AcOH}}

yellow ppt (

K_3[Co(NO_2)_6]\downarrow

yellow).

(A)ZnS
(B)CoS
(C)MnS
(D)NiS

Q13·ChemistryIntegerJEE Main 2025

Among the following cations, the number of cations which will give characteristic precipitate in their identification tests with

K_4[Fe(CN)_6]

is :

Cu^{2+},\ Fe^{3+},\ Ba^{2+},\ Ca^{2+},\ NH_4^+,\ Mg^{2+},\ Zn^{2+}

Q14·ChemistrySingle correctJEE Main 2025

Identify A, B and C in the given below reaction sequence:

A\xrightarrow{HNO_3}Pb(NO_3)_2\xrightarrow{H_2SO_4}B\xrightarrow{\text{(1) ammonium acetate, (2) acetic acid, (3) }K_2CrO_4}C

(Yellow ppt).

(A) $PbCl_2,\ PbSO_4,\ PbCrO_4$
(B) $PbS,\ PbSO_4,\ PbCrO_4$
(C) $PbS,\ PbSO_4,\ Pb(CH_3COO)_2$
(D) $PbCl_2,\ Pb(SO_4)_2,\ PbCrO_4$

Q15·ChemistryNumericalJEE Main 2024

Consider the following test for a group-IV cation:

M^{2+}+H_2S\rightarrow A

(Black precipitate) + byproduct;

A+

aqua regia

\rightarrow B+NOCl+S+H_2O

;

B+KNO_2+CH_3COOH\rightarrow C

+ byproduct. The spin-only magnetic moment value of the metal complex C is _______ BM (nearest integer).

Q16·ChemistrySingle correctJEE Main 2024

In qualitative test for identification of presence of phosphorous, the compound is heated with an oxidising agent, which is further treated with nitric acid and ammonium molybdate respectively. The yellow coloured precipitate obtained is:

(A) $\text{Na}_3\text{PO}_4\cdot 12\text{MoO}_3$
(B) $(\text{NH}_4)_3\text{PO}_4\cdot 12(\text{NH}_4)_2\text{MoO}_4$
(C) $(\text{NH}_4)_3\text{PO}_4\cdot 12\text{MoO}_3$
(D) $\text{MoPO}_4\cdot 21\text{NH}_4\text{NO}_3$

Q17·ChemistrySingle correctJEE Main 2024

Match List-I (dry tests in qualitative analysis) with List-II (reaction sequence involved, M is metal). Choose the correct answer from the options given below:

List-I (Name of the test)	List-II (Reaction sequence)
A.Borax bead test	I. $MCO_3\to MO\xrightarrow{CO/\Delta}$ coloured residue with CoO
B.Charcoal cavity test	II. $MCO_3\to MCl_2\to M^{2+}$ (volatile chloride coloured flame)
C.Cobalt nitrate test	III. $MSO_4\xrightarrow{Na_2CO_3/\Delta}M(BO_2)_2$ (coloured borate bead)
D.Flame test	IV. $MSO_4\xrightarrow{Na_2CO_3/\Delta}MCO_3\to MO\to M$ (reduction to metal in cavity)

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

Q18·ChemistrySingle correctJEE Main 2024

During the detection of acidic radical present in a salt, a student gets a pale yellow precipitate soluble with difficulty in

NH_4OH

solution when sodium carbonate extract was first acidified with dil.

HNO_3

and then

AgNO_3

solution was added. This indicates presence of:

(A) $Br^-$
(B) $CO_3^{2-}$
(C) $I^-$
(D) $Cl^-$

Q19·ChemistrySingle correctJEE Main 2024

Match List-I (Precipitating reagent and conditions) with List-II (Cation). Choose the correct answer from the options given below:

List-I (Precipitating reagent and conditions)	List-II (Cation)
A. $NH_4Cl + NH_4OH$	I. $Mn^{2+}$
B. $NH_4OH + Na_2CO_3$	II. $Pb^{2+}$
C. $NH_4OH + NH_4Cl + H_2S$ gas	III. $Al^{3+}$
D.dilute HCl	IV. $Sr^{2+}$

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

Q20·ChemistrySingle correctJEE Main 2024

In the precipitation of the iron group (III) in qualitative analysis, ammonium chloride is added before adding ammonium hydroxide to:

(A)prevent interference by phosphate ions
(B)decrease concentration of $^-OH$ ions
(C)increase concentration of $Cl^-$ ions
(D)increase concentration of $NH_4^+$ ions

Q21·ChemistryNumericalJEE Main 2024

The number of coloured salts among the following is ___. (A)

SrSO_4

(B)

Mg(NH_4)PO_4

(C)

BaCrO_4

(D)

Mn(OH)_2

(E)

PbSO_4

(F)

PbCrO_4

(G)

AgBr

(H)

PbI_2

(I)

CaC_2O_4

(J)

[Fe(OH)_2(CH_3COO)]

Q22·ChemistrySingle correctJEE Main 2024

The compound that is white in color is

(A)ammonium sulphide
(B)lead sulphate
(C)lead iodide
(D)ammonium arsinomolybdate

Q23·ChemistrySingle correctJEE Main 2024

Given below are two statements: Statement-I: The gas liberated on warming a salt with dil

H_2SO_4

, turns a piece of paper dipped in lead acetate into black, it is a confirmatory test for sulphide ion. Statement-II: In statement-I the colour of paper turns black because of formation of lead sulphide. 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.

Q24·ChemistrySingle correctJEE Main 2023

In the wet tests for detection of various cations by precipitation,

Ba^{2+}

cations are detected by obtaining precipitate of

(A) $Ba(ox)$ : Barium oxalate
(B) $BaCO_3$
(C) $Ba(OAc)_2$
(D) $BaSO_4$

Q25·ChemistrySingle correctJEE Main 2023

When a solution of mixture having two inorganic salts was treated with freshly prepared ferrous sulphate in acidic medium, a dark brown ring was formed whereas on treatment with neutral

FeCl_3

, it gave deep red colour which disappeared on boiling and a brown red ppt was formed. The mixture contains

(A) $CH_3COO^-$ & $NO_3^-$
(B) $C_2O_4^{2-}$ & $NO_3^-$
(C) $SO_3^{2-}$ & $CH_3COO^-$
(D) $SO_3^{2-}$ & $C_2O_4^{2-}$

Q26·ChemistrySingle correctJEE Main 2023

Element not present in Nessler's reagent is:

(A)Hg
(B)I
(C)K
(D)N

Q27·ChemistrySingle correctJEE Main 2023

Formation of which complex, among the following, is not a confirmatory test of

Pb^{2+}

ions

(A)lead chromate
(B)lead iodide
(C)lead nitrate
(D)lead sulphate

Q28·ChemistrySingle correctJEE Main 2023

Which element is not present in Nessler's reagent?

(A)Oxygen
(B)Potassium
(C)Mercury
(D)Iodine

Q29·ChemistrySingle correctJEE Main 2023

In the wet tests for identification of various cations by precipitation, which transition element cation doesn't belong to group IV in qualitative inorganic analysis?

(A)Ni $^{2+}$
(B)Zn $^{2+}$
(C)Co $^{2+}$
(D)Fe $^{3+}$

Q30·ChemistrySingle correctJEE Main 2023

During the qualitative analysis of

SO_3^{2-}

using dilute

H_2SO_4

SO_2

gas is evolved which turns

K_2Cr_2O_7

solution (acidified with dilute

H_2SO_4

(A)green
(B)blue
(C)red
(D)black

Q31·ChemistrySingle correctJEE Main 2023

The formula for Nessler's reagent is:

(A) $HgI_2$
(B) $K_2HgI_4$
(C) $KHgI_3$
(D) $KHg_2I_2$

Q32·ChemistrySingle correctJEE Main 2023

During the borax bead test with CuSO

_4

, a blue green colour of the bead was observed in oxidising flame due to the formation of:

(A)CuO
(B)Cu(BO $_2$ ) $_2$
(C)Cu $_3$ B $_2$
(D)Cu

Q33·ChemistrySingle correctJEE Main 2023

A chloride salt solution acidified with dil.

HNO_3

gives a curdy white precipitate, [A], on addition of

AgNO_3

. [A] on treatment with

NH_4OH

gives a clear solution, B. A and B are respectively

(A) $AgCl$ & $(NH_4)[Ag(OH)_2]$
(B) $AgCl$ & $[Ag(NH_3)_2]Cl$
(C) $H[AgCl_3]$ & $(NH_4)[Ag(OH)_2]$
(D) $H[AgCl_3]$ & $[Ag(NH_3)_2]Cl$

Q34·ChemistrySingle correctJEE Main 2023

Match List-I (Cations) with List-II (Group reagents). Choose the correct match from the options given below:

List-I (Cations)	List-II (Group reagents)
A. $Pb^{2+}, Cu^{2+}$	i. $H_2S$ gas in presence of dilute HCl
B. $Al^{3+}, Fe^{3+}$	ii. $(NH_4)_2CO_3$ in presence of $NH_4OH$
C. $Co^{2+}, Ni^{2+}$	iii. $NH_4OH$ in presence of $NH_4Cl$
D. $Ba^{2+}, Ca^{2+}$	iv. $H_2S$ in presence of $NH_4OH$

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

Q35·ChemistrySingle correctJEE Main 2022

^{3+}

cation gives a prussian blue precipitate on addition of potassium ferrocyanide solution due to the formation of:

(A)[Fe(H $_{2}$ O) $_{6}$ ] $_{2}$ [Fe(CN) $_{6}$ ]
(B)Fe $_{2}$ [Fe(CN) $_{6}$ ] $_{2}$
(C)Fe $_{3}$ [Fe(OH) $_{2}$ (CN) $_{4}$ ] $_{2}$
(D)Fe $_{4}$ [Fe(CN) $_{6}$ ] $_{3}$

Q36·ChemistrySingle correctJEE Main 2022

A white precipitate was formed when BaCl

_2

was added to water extract of an inorganic salt. Further, a gas 'X' with characteristic odour was released when the formed white precipitate was dissolved in dilute HCl. The anion present in the inorganic salt is :

(A)I $^-$
(B)SO $_3^{2-}$
(C)S $^{2-}$
(D)NO $_2^-$

Q37·ChemistrySingle correctJEE Main 2022

Match List I with List II List I (Anion) A. CO

_3^{2-}

B. S

^{2-}

C. SO

_3^{2-}

D. NO

_2^-

List II (Gas evolved on reaction with dil. H

_2

_4

) I. Colourless gas which turns lead acetate paper black II. Colourless gas which turns acidified potassium dichromate solution green. III. Brown fumes which turns acidified KI solution containing starch blue. IV. Colourless gas evolved with brisk effervescence, which turns lime water milky. Choose the correct answer from the options given below:

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

Q38·ChemistrySingle correctJEE Main 2022

Which statement is not true with respect to nitrate ion test ?

(A)A dark brown ring is formed at the junction of two solutions.
(B)Ring is formed due to nitroferrous sulphate complex.
(C)The brown complex is $[Fe(H_{2}O)_{5} (NO)]SO_{4}$ .
(D)Heating the nitrate salt with conc. $H_{2}SO_{4}$ , light brown fumes are evolved.

Q39·ChemistrySingle correctJEE Main 2022

During the qualitative analysis of salt with cation y

^{2+}

, addition of a reagent (X) to alkaline solution of the salt gives a bright red precipitate. The reagent (X) and the cation (y

^{2+}

) present respectively are:

(A)Dimethylglyoxime and Ni $^{2+}$
(B)Dimethylglyoxime and Co $^{2+}$
(C)Nessler's reagent and Hg $^{2+}$
(D)Nessler's reagent and Ni $^{2+}$

Q40·ChemistrySingle correctJEE Main 2022

In the flame test of a mixture of salts, a green flame with blue centre was observed. Which one of the following cations may be present?

(A)Cu $^{2+}$
(B)Sr $^{2+}$
(C)Ba $^{2+}$
(D)Ca $^{2+}$

Q41·ChemistrySingle correctJEE Advanced 2021

The reaction of K

_{3}

[Fe(CN)

_{6}

] with freshly prepared FeSO

_{4}

solution produces a dark blue precipitate called Turnbull's blue. Reaction of K

_{4}

[Fe(CN)

_{6}

] with the FeSO

_{4}

solution in complete absence of air produces a white precipitate X, which turns blue in air. Mixing the FeSO

_{4}

solution with NaNO

_{3}

, followed by a slow addition of concentrated H

_{2}

_{4}

through the side of the test tube produces a brown ring. Among the following, the brown ring is due to the formation of

(A)[Fe(NO) $_{2}$ (SO $_{4}$ ) $_{2}$ ] $^{2-}$
(B)[Fe(NO) $_{2}$ (H $_{2}$ O) $_{4}$ ] $^{3+}$
(C)[Fe(NO) $_{4}$ (SO $_{4}$ ) $_{2}$ ]
(D)[Fe(NO)(H $_{2}$ O) $_{5}$ ] $^{2+}$

Q42·ChemistryMultiple correctJEE Advanced 2021

A mixture of two salts is used to prepare a solution

\mathbf{S}

, which gives the following results : White precipitate(s) only

\xleftarrow[\text{Room temperature}]{\text{Dilute NaOH(aq.)}}

\mathbf{S}

(aq. solution of the salts)

\xrightarrow[\text{Room temperature}]{\text{Dilute HCl(aq.)}}

White precipitate(s) only The correct option(s) for the salt mixture is(are)

(A) $\mathrm{Pb(NO_3)_2}$ and $\mathrm{Zn(NO_3)_2}$
(B) $\mathrm{Pb(NO_3)_2}$ and $\mathrm{Bi(NO_3)_3}$
(C) $\mathrm{AgNO_3}$ and $\mathrm{Bi(NO_3)_3}$
(D) $\mathrm{Pb(NO_3)_2}$ and $\mathrm{Hg(NO_3)_2}$

Q43·ChemistrySingle correctJEE Advanced 2021

The reaction of K

_{3}

[Fe(CN)

_{6}

] with freshly prepared FeSO

_{4}

solution produces a dark blue precipitate called Turnbull's blue. Reaction of K

_{4}

[Fe(CN)

_{6}

] with the FeSO

_{4}

solution in complete absence of air produces a white precipitate X, which turns blue in air. Mixing the FeSO

_{4}

solution with NaNO

_{3}

, followed by a slow addition of concentrated H

_{2}

_{4}

through the side of the test tube produces a brown ring. Precipitate

\mathbf{X}

(A)Fe $_{4}$ [Fe(CN) $_{6}$ ] $_{3}$
(B)Fe[Fe(CN) $_{6}$ ]
(C)K $_{2}$ Fe[Fe(CN) $_{6}$ ]
(D)KFe[Fe(CN) $_{6}$ ]

Q44·ChemistrySingle correctJEE Main 2021

The potassium ferrocyanide solution gives a Prussian blue colour, when added to :

(A)CoCl $_{3}$
(B)FeCl $_{2}$
(C)CoCl $_{2}$
(D)FeCl $_{3}$

Q45·ChemistrySingle correctJEE Main 2021

Match List-I with List-II : List-I (Metal Ion) (a)

\mathrm{Mn^{2+}}

(b)

\mathrm{As^{3+}}

(c)

\mathrm{Cu^{2+}}

(d)

\mathrm{Al^{3+}}

List-II (Group in Qualitative analysis) (i) Group - III (ii) Group - IIA (iii) Group - IV (iv) Group - IIB Choose the most appropriate answer from the options given below :

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

Q46·ChemistryNumericalJEE Main 2021

Consider the sulphides HgS, PbS, CuS,

\mathrm{Sb_2S_3}

\mathrm{As_2S_3}

and CdS. Number of these sulphides soluble in 50%

\mathrm{HNO_3}

is ____.

Q47·ChemistrySingle correctJEE Main 2021

To an aqueous solution containing ions such as Al

^{3+}

,Zn

^{2+}

,Ca

^{2+}

,Fe

^{3+}

,Ni

^{2+}

,Ba

^{2+}

and Cu

^{2+}

was added conc. HCl, followed by H

_2

S . The total number of cations precipitated during this reaction is / are:

(A)4
(B)1
(C)3
(D)2

Q48·ChemistrySingle correctJEE Main 2021

An inorganic compound ‘X’ on treatment with concentrated

H_{2}SO_{4}

produces brown fumes and gives dark brown ring with

FeSO_{4}

in presence of concentrated

H_{2}SO_{4}

. Also compound ‘X’ gives precipitate ‘Y’, when its solution in dilute HCl is treated with

H_{2}S

gas. The precipitate ‘Y’ on treatment with concentrated

HNO_{3}

followed by excess of

NH_{4}OH

further gives deep blue coloured solution, Compound ‘X’ is:

(A) $Cu(NO_{3})_{2}$
(B) $Pb(NO_{3})_{2}$
(C) $Co(NO_{3})_{2}$
(D) $Pb(NO_{2})_{2}$

Q49·ChemistrySingle correctJEE Main 2021

Reagent, 1-naphthylamine and sulphanilic acid in acetic acid is used for the detection of

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

Q50·ChemistrySingle correctJEE Main 2021

On treating a compound with warm dil. H

_2

_4

, gas X is evolved which turns K

_2

_2

_7

paper acidified with dil. H

_2

_4

to a green compound Y. X and Y respectively are :

(A)X = SO $_2$ , Y = Cr $_2$ (SO $_4$ ) $_3$
(B)X = SO $_2$ , Y = Cr $_2$ O $_3$
(C)X = SO $_3$ , Y = Cr $_2$ O $_3$
(D)X = SO $_3$ , Y = Cr $_2$ (SO $_4$ ) $_3$

Q51·ChemistrySingle correctJEE Main 2021

Given below are two statements : Statement I : Colourless cupric metaborate is reduced to cuprous metaborate in a luminous flame. Statement II : Cuprous metaborate is obtained by heating boric anhydride and copper sulphate in a non-luminous flame. 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)Statement I is true but Statement II is false.
(C)Both Statement I and Statement II are true.
(D)Both Statement I and Statement II are false.

Q52·ChemistrySingle correctJEE Advanced 2020

A colorless aqueous solution contains nitrates of two metals, X and Y. When it was added to an aqueous solution of NaCl, a white precipitate was formed. This precipitate was found to be partly soluble in hot water to give a residue P and a solution Q. The residue P was soluble in aq.

NH_3

and also in excess sodium thiosulfate. The hot solution Q gave a yellow precipitate with KI. The metals X and Y, respectively, are

(A)Ag and Pb
(B)Ag and Cd
(C)Cd and Pb
(D)Cd and Zn

Q53·ChemistrySingle correctJEE Advanced 2019

The green colour produced in the borax bead test of a chromium(III) salt is due to

(A)CrB
(B)Cr $_{2}$ O $_{3}$
(C)Cr $_{2}$ (B $_{4}$ O $_{7}$ ) $_{3}$
(D)Cr(BO $_{2}$ ) $_{3}$

Q54·ChemistryMultiple correctJEE Advanced 2018

The correct option(s) to distinguish nitrate salts of

Mn^{2+}

and

Cu^{2+}

taken separately is (are)

(A) $Mn^{2+}$ shows the characteristic green colour in the flame test
(B)Only $Cu^{2+}$ shows the formation of precipitate by passing $H_{2}S$ in acidic medium
(C)Only $Mn^{2+}$ shows the formation of precipitate by passing $H_{2}S$ in faintly basic medium
(D) $Cu^{2+}/Cu$ has higher reduction potential than $Mn^{2+}/Mn$ (measured under similar conditions)

Q55·ChemistrySingle correctJEE Advanced 2016

In the following reaction sequence in aqueous solution, the species X, Y and Z, respectively, are

S_{2}O_{3}^{2-} \xrightarrow{Ag^{+}} \underset{\text{clear solution}}{X} \xrightarrow{Ag^{+}} \underset{\text{white precipitate}}{Y} \xrightarrow{\text{with time}} \underset{\text{black precipitate}}{Z}

(A) $[Ag(S_{2}O_{3})_{2}]^{3-}$ , $Ag_{2}S_{2}O_{3}$ , $Ag_{2}S$
(B) $[Ag(S_{2}O_{3})_{3}]^{5-}$ , $Ag_{2}SO_{3}$ , $Ag_{2}S$
(C) $[Ag(SO_{3})_{2}]^{3-}$ , $Ag_{2}S_{2}O_{3}$ , $Ag$
(D) $[Ag(SO_{3})_{3}]^{3-}$ , $Ag_{2}SO_{4}$ , $Ag$

Q56·ChemistryMultiple correctJEE Advanced 2016

The reagent(s) that can selectively precipitate

S^{2-}

from a mixture of

S^{2-}

and

SO_{4}^{2-}

in aqueous solution is(are)

(A) $CuCl_{2}$
(B) $BaCl_{2}$
(C) $Pb(OOCCH_{3})_{2}$
(D) $Na_{2}[Fe(CN)_{5}NO]$

Q57·ChemistryMultiple correctJEE Advanced 2015

The pair(s) of ions where BOTH the ions are precipitated upon passing

\mathrm{H_{2}S}

gas in presence of dilute HCl, is(are)

(A) $\mathrm{Ba^{2+}}$ , $\mathrm{Zn^{2+}}$
(B) $\mathrm{Bi^{3+}}$ , $\mathrm{Fe^{3+}}$
(C) $\mathrm{Cu^{2+}}$ , $\mathrm{Pb^{2+}}$
(D) $\mathrm{Hg^{2+}}$ , $\mathrm{Bi^{3+}}$

Q58·ChemistryIntegerJEE Advanced 2014

Among

PbS

CuS

HgS

MnS

Ag_2S

NiS

CoS

Bi_2S_3

and

SnS_2

, the total number of BLACK coloured sulphides is

Q59·ChemistrySingle correctJEE Advanced 2014

An aqueous solution of metal ion M1 reacts separately with reagents Q and R in excess to give tetrahedral and square planar complexes, respectively. An aqueous solution of another metal ion M2 always forms tetrahedral complexes with these reagents. Aqueous solution of M2 on reaction with reagent S gives white precipitate which dissolves in excess of S. The reactions are summarized in the scheme given below. Reagent S is

(A) $\mathrm{K_4[Fe(CN)_6]}$
(B) $\mathrm{Na_2HPO_4}$
(C) $\mathrm{K_2CrO_4}$
(D)KOH

Q60·ChemistrySingle correctJEE Advanced 2013

An aqueous solution of a mixture of two inorganic salts, when treated with dilute HCl, gave a precipitate (P) and a filtrate (Q). The precipitate P was found to dissolve in hot water. The filtrate (Q) remained unchanged, when treated with

\mathrm{H_2S}

in a dilute mineral acid medium. However, it gave a precipitate (R) with

\mathrm{H_2S}

in an ammoniacal medium. The precipitate R gave a coloured solution (S), when treated with

\mathrm{H_2O_2}

in an aqueous NaOH medium. The coloured solution S contains

(A) $\mathrm{Fe_2(SO_4)_3}$
(B) $\mathrm{CuSO_4}$
(C) $\mathrm{ZnSO_4}$
(D) $\mathrm{Na_2CrO_4}$

Q61·ChemistrySingle correctJEE Advanced 2013

Upon treatment with ammoniacal

H_2S

, the metal ion that precipitates as a sulfide is

(A)Fe(III)
(B)Al(III)
(C)Mg(II)
(D)Zn(II)

Q62·ChemistrySingle correctJEE Advanced 2013

\mathrm{H_2S}

in a dilute mineral acid medium. However, it gave a precipitate (R) with

\mathrm{H_2S}

in an ammoniacal medium. The precipitate R gave a coloured solution (S), when treated with

\mathrm{H_2O_2}

in an aqueous NaOH medium. The precipitate P contains

(A) $\mathrm{Pb^{2+}}$
(B) $\mathrm{Hg_2^{2+}}$
(C) $\mathrm{Ag^{+}}$
(D) $\mathrm{Hg^{2+}}$

Principles of Qualitative Analysis — frequently asked

How many questions from Principles of Qualitative Analysis appear in JEE?

Principles of Qualitative Analysis has appeared in 58 of the last 186 JEE Main and JEE Advanced papers — about 31% of them — contributing 62 questions in total across those papers.

Is Principles of Qualitative Analysis an important chapter for JEE?

Judged by how often it is actually tested, it appears in roughly 31% 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 Principles of Qualitative Analysis 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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