Match List – I with List – II

List – I (Anion) List – II
(Gas evolved on reaction with dil. $H_{2} S O_{4}$ )

A $C O_{3}^{2 -}$ I Colourless gas which turns lead acetate paper black
B $S^{2 -}$ II Colourless gas which turns acidified potassium dichromate solution green.
C $S O_{3}^{2 -}$ III Brown fumes which turns acidified KI solution containing starch blue
D $N O_{2}^{-}$ IV Colourless gas evolved with brisk effervescence, which turns lime water milky
Choose the correct answer from the options given below :

A B C D
1 III I II IV
2 II I IV III
3 IV I III II
4 IV I II III

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answer is D.

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Detailed Solution

$\Rightarrow N a_{2} C O_{3} + H_{2} S O_{4} (d i l) \to N a_{2} S O_{4} + H_{2} O + C O_{2} ↑$
$C O_{2_{(g)}} + C a {(O H)}_{2} a q \to \underset{w h i t e}{C a C O_{3} (s)}$
$\Rightarrow N a_{2} S + H_{2} S O_{4} (d i l) \to N a_{2} S O_{4} + H_{2} S ↑$
$H_{2} S + P b {(C H_{3} C O O)}_{2} \to \underset{B l a c k}{P b S} + 2 C H_{3} C O O H$
$\Rightarrow N a_{2} S O_{3} + H_{2} S O_{4} (d i l) \to N a_{2} S O_{4} + H_{2} O + S O_{2} ↑$
$C r_{2} O_{7}^{- 2} + S O_{2} \to \underset{g r e e n}{C r^{+ 3}}$
$\Rightarrow 2 K N O_{2} + H_{2} S O_{4} \to H N O_{2} + K_{2} S O_{4}$
$2 H N O_{2} \to H N O_{3} + 2 N O ↑ + H_{2} O$
$2 N O + O_{2} \to \underset{(Re d d i s h b r o w n)}{2 N O_{2} ↑}$
$2 K I + 2 H_{2} S O_{4} + 2 H N O_{2} \to 2 K H S O_{4} + I_{2} + 2 N O + 2 H_{2} O$

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	List – I (Anion)		List – II (Gas evolved on reaction with dil. $H_{2} S O_{4}$ )
A	$C O_{3}^{2 -}$	I	Colourless gas which turns lead acetate paper black
B	$S^{2 -}$	II	Colourless gas which turns acidified potassium dichromate solution green.
C	$S O_{3}^{2 -}$	III	Brown fumes which turns acidified KI solution containing starch blue
D	$N O_{2}^{-}$	IV	Colourless gas evolved with brisk effervescence, which turns lime water milky