MCQ (Single Correct Answer)

1

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

JEE Advanced 2025 Paper 2 Online
2

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 $\mathrm{H_2S}$ in the presence of $\mathrm{NH_4OH}$ (1) $\mathrm{Cu^{2+}}$
(Q) $\mathrm{(NH_4)_2CO_3}$ in the presence of $\mathrm{NH_4OH}$ (2) $\mathrm{Al^{3+}}$
(R) $\mathrm{NH_4OH}$ in the presence of $\mathrm{NH_4Cl}$ (3) $\mathrm{Mn^{2+}}$
(S) Passing $\mathrm{H_2S}$ in the presence of dilute $\mathrm{HCl}$ (4) $\mathrm{Ba^{2+}}$
(5) $\mathrm{Mg^{2+}}$
JEE Advanced 2025 Paper 1 Online
3
Precipitate X is
JEE Advanced 2021 Paper 2 Online
4
Among the following, the brown ring is due to the formation of
JEE Advanced 2021 Paper 2 Online
5
M1, Q and R, respectively, are
JEE Advanced 2014 Paper 2 Offline
6

Reagent S is

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7

The precipitate P contains

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8

The coloured solution S contains

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9
The metal rod M is
IIT-JEE 2011 Paper 1 Offline
10

The compound N is

IIT-JEE 2011 Paper 1 Offline
11

The final solution contains :

IIT-JEE 2011 Paper 1 Offline
12

Passing H2S gas into a mixture of Mn2+, Ni2+, Cu2+ and Hg2+ ions in an acidified aqueous solution precipitates

IIT-JEE 2011 Paper 2 Offline
13

The compound X is

IIT-JEE 2009 Paper 1 Offline
14

The compound Y is

IIT-JEE 2009 Paper 1 Offline
15

The compound Z is

IIT-JEE 2009 Paper 1 Offline

Numerical

Subjective

1
A is binary compound of a univalent metal. 1.422 g of A reacts completely with 0.321 g of sulphur in an evacuated and sealed tube to give 1.743 g of a white crystalline solid B, that forms a hydrated double salt, C with Al2 (SO4)3 . Identify A, B and C.
IIT-JEE 1994
2

When 16.8 g of white solid X were heated, 4.4 g of acid gas A, that turned lime water milky was driven off together with 1.8 g of a gas B which condensed to a colourless liquid.

The solid that remained, Y, dissolved in water to give an alkaline solution, which with excess barium chloride solution gave a white precipitate Z. The precipitate efferversced with acid giving off carbon dioxide. Identify A, B and Y and write down the equation for the thermal decomposition of X.

IIT-JEE 1984
3

Explain the following in not more than two sentenses.

A solution of FeCl3 in water gives a brown precipitate on standing.

IIT-JEE 1980
4

Compound A is a light green crystalline solid. It gives the following tests :

(i) It dissolves in dilute sulphuric acid. No gas is produced.

(ii) A drop of KMnO4 is added to the above solution. The pink colour disappears.

(iii) Compound A is heated strongly. Gases B and C, with pungent smell, come out. A brown residue D is left behind.

(iv) The gas mixture (B and C) is passed into a dichromate solution. The solution turns green.

(v) The green solution from step (iv) gives a white precipitate E with a solution of barium nitrate.

(vi) Residue D from step (iii) is heated on charcoal in a reducing flame. It gives a magnetic substance E.

Name the compounds A, B, C, D and E.

IIT-JEE 1980
5

A white amorphous powder (A) on heating yields a colourless, non-combustible gas (B) and a solid (C). The latter compound assumes a yellow colour on heating and changes to white on cooling. (C) dissolves in dilute acid and the resulting solution gives a white precipitate on adding K4Fe(CN)6 solution.

(A) dissolves in dilute HCl with the evolution of gas, which is identical in all respects with (B). The gas (B) turns lime water milky, but the milkiness disappears with the continuous passage of gas. The solution of (A), as obtained above, gives a white precipitate (D) on the addition of excess of NH4OH and passing H2S. Another portion of the solution gives initially a white precipitate (E) on the addition of sodium hydroxide solution, which dissolves on further addition of the base. Identify the compounds (A), (B), (C), (D) and (E).

IIT-JEE 1979
6
The precipitation of second group sulphides in qualitative analysis is carried out with hydrogen sulphide in the presence of hydrochloric acid but not in nitric acid. Explain.
IIT-JEE 1979
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