Match List I with List II. List-I (Anion) List-II (gas evolved on reaction with dil. ${H}_{2}{\mathrm{SO}}_{4}$) (A) ${\mathrm{CO}}_{3}^{2-}$ (I) Colourless gas which turns lead acetate paper black. (B) ${S}^{2-}$ (II) Colourless gas which turns acidified potassium dichromate solution green. (C) ${\mathrm{SO}}_{3}^{2-}$ (III) Brown fumes which turns acidified KI solution containing starch blue. (D) ${\mathrm{NO}}_{2}^{-}$ (IV) Colourless gas evolved with brisk effervescence, which turns lime water milky. Choose the correct answer from the options given below

When small amount of carbonate salt is treated with dilute ${H}_{2}{\mathrm{SO}}_{4}$ or dilute $\mathrm{HCl}$, A colourless, odourless gas $({\mathrm{CO}}_{2})$ is evolved with brisk effervescence When small amount of the following salts are treated with dilute ${H}_{2}{\mathrm{SO}}_{4}$ the following observations are seen. Carbonate salt $({\mathrm{CO}}_{3}^{2-})$ Brisk effervescence of ${\mathrm{CO}}_{2}$ gas, ${\mathrm{CO}}_{3}^{2-}+{H}_{2}{\mathrm{SO}}_{4}\rightarrow {\mathrm{SO}}_{4}^{2-}+{H}_{2}O+{\mathrm{CO}}_{2}\uparrow$ Sulphide salt $({S}^{-2})$ A colourless gas $({H}_{2}S)$ with rotten egg smell ${\mathrm{Na}}_{2}S+{H}_{2}{\mathrm{SO}}_{4}\rightarrow {\mathrm{Na}}_{2}{\mathrm{SO}}_{4}+{H}_{2}S\uparrow$ NO$^{2 –}$$^{ }$ on reaction with dilute H$_{2}$SO$_{4 }$will give brown NO$_{2}$(g) will turn KI solution blue. ${\mathrm{SO}}_{3}^{2-}$on reaction with dilute ${H}_{2}{\mathrm{SO}}_{4}$ will give ${\mathrm{SO}}_{2}(g)$, which will turn acidified potassium dichromate solution green.

JEE Main 2022 — Chemistry Inorganic Chemistry

2022mcqmedium

Match List I with List II.

	List-I (Anion)		List-II (gas evolved on reaction with dil. ${H}_{2}{\mathrm{SO}}_{4}$ )
(A)	${\mathrm{CO}}_{3}^{2-}$	(I)	Colourless gas which turns lead acetate paper black.
(B)	${S}^{2-}$	(II)	Colourless gas which turns acidified potassium dichromate solution green.
(C)	${\mathrm{SO}}_{3}^{2-}$	(III)	Brown fumes which turns acidified KI solution containing starch blue.
(D)	${\mathrm{NO}}_{2}^{-}$	(IV)	Colourless gas evolved with brisk effervescence, which turns lime water milky.

Choose the correct answer from the options given below

Official previous-year question

Held on 27 Jun 2022 · Verified 6 Jul 2026.

Options

A
$A-\mathrm{III},B-I,C-\mathrm{II},D-\mathrm{IV}$
B
$A-\mathrm{II},B-I,C-\mathrm{IV},D-\mathrm{III}$
C
$A-\mathrm{IV},B-I,C-\mathrm{III},D-\mathrm{II}$
D
$A-\mathrm{IV},B-I,C-\mathrm{II},D-\mathrm{III}$

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Solution

When small amount of carbonate salt is treated with dilute ${H}_{2}{\mathrm{SO}}_{4}$ or dilute $\mathrm{HCl}$ , A colourless, odourless gas $({\mathrm{CO}}_{2})$ is evolved with brisk effervescence

When small amount of the following salts are treated with dilute ${H}_{2}{\mathrm{SO}}_{4}$ the following observations are seen.

Carbonate salt $({\mathrm{CO}}_{3}^{2-})$	Brisk effervescence of ${\mathrm{CO}}_{2}$ gas, ${\mathrm{CO}}_{3}^{2-}+{H}_{2}{\mathrm{SO}}_{4}\rightarrow {\mathrm{SO}}_{4}^{2-}+{H}_{2}O+{\mathrm{CO}}_{2}\uparrow$
Sulphide salt $({S}^{-2})$	A colourless gas $({H}_{2}S)$ with rotten egg smell

{\mathrm{Na}}_{2}S+{H}_{2}{\mathrm{SO}}_{4}\rightarrow {\mathrm{Na}}_{2}{\mathrm{SO}}_{4}+{H}_{2}S\uparrow

NO $^{2 –}$ $^{ }$ on reaction with dilute H $_{2}$ SO $_{4 }$ will give brown NO $_{2}$ (g) will turn KI solution blue.

${\mathrm{SO}}_{3}^{2-}$ on reaction with dilute ${H}_{2}{\mathrm{SO}}_{4}$ will give ${\mathrm{SO}}_{2}(g)$ , which will turn acidified potassium dichromate solution green.

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Options

$A-\mathrm{III},B-I,C-\mathrm{II},D-\mathrm{IV}$

$A-\mathrm{II},B-I,C-\mathrm{IV},D-\mathrm{III}$

$A-\mathrm{IV},B-I,C-\mathrm{III},D-\mathrm{II}$

$A-\mathrm{IV},B-I,C-\mathrm{II},D-\mathrm{III}$

Solution

When small amount of carbonate salt is treated with dilute ${H}_{2}{\mathrm{SO}}_{4}$ or dilute $\mathrm{HCl}$ , A colourless, odourless gas $({\mathrm{CO}}_{2})$ is evolved with brisk effervescence

When small amount of the following salts are treated with dilute ${H}_{2}{\mathrm{SO}}_{4}$ the following observations are seen.

Carbonate salt $({\mathrm{CO}}_{3}^{2-})$	Brisk effervescence of ${\mathrm{CO}}_{2}$ gas, ${\mathrm{CO}}_{3}^{2-}+{H}_{2}{\mathrm{SO}}_{4}\rightarrow {\mathrm{SO}}_{4}^{2-}+{H}_{2}O+{\mathrm{CO}}_{2}\uparrow$
Sulphide salt $({S}^{-2})$	A colourless gas $({H}_{2}S)$ with rotten egg smell

{\mathrm{Na}}_{2}S+{H}_{2}{\mathrm{SO}}_{4}\rightarrow {\mathrm{Na}}_{2}{\mathrm{SO}}_{4}+{H}_{2}S\uparrow

NO $^{2 –}$ $^{ }$ on reaction with dilute H $_{2}$ SO $_{4 }$ will give brown NO $_{2}$ (g) will turn KI solution blue.

${\mathrm{SO}}_{3}^{2-}$ on reaction with dilute ${H}_{2}{\mathrm{SO}}_{4}$ will give ${\mathrm{SO}}_{2}(g)$ , which will turn acidified potassium dichromate solution green.

JEE Main 2022 — Chemistry Inorganic Chemistry

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JEE Main 2022 — Chemistry Inorganic Chemistry

Options

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Solution

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JEE Main Inorganic Chemistry in other years

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