Match List I with List II. List-I (Anion) List-II (gas evolved on reaction with dil. H 2 SO 4 ) (A) 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) SO 3 2 - (III) Brown fumes which turns acidified KI solution containing starch blue. (D) NO 2 - (IV) Colourless gas evolved with brisk effervescence, which turns lime water milky. Choose the correct answer from the options given below

Question

Match List I with List II. List-I (Anion) List-II (gas evolved on reaction with dil. H 2 SO 4 ) (A) 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) SO 3 2 - (III) Brown fumes which turns acidified KI solution containing starch blue. (D) NO 2 - (IV) Colourless gas evolved with brisk effervescence, which turns lime water milky. Choose the correct answer from the options given below, A - III , B - I , C - II , D - IV, A - II , B - I , C - IV , D - III, A - IV , B - I , C - III , D - II, A - IV , B - I , C - II , D - III

MARKS App · Accepted Answer

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

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

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