Question

Match List I with List II.	List I (Anion)		List II (gas evolved on reaction with dil $H_2SO_4$)
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. 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

Answer 1

Answer: (D)

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

Answer 2

$CO_3^{ 2−}$: On action of diluted sulphuric acid, $CO_2$ gas is released which turns lime water milky.

$S ^{2-}:$ On action of diluted sulphuric acid, $H_2S$ gas is released which turns lead acetate paper black.

$SO_3^{ 2−}$: On action of diluted $H_2SO_4, SO_2$ gas is evolved which turns acidified potassium dichromate solution green.

$NO^{2−}$: On action of dil $H_2SO_4, NO_2$ gas is evolved which turns Kl solution contain starch blue.

$Hence,$ the correct option is (D): $A-IV, B-I, C-II, D-III$