Question

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. 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)

$C{O}_3{}^{2-}$ will give $C{O}_2(g)$ which will turns lime water milky.
$S^{2-}$ will give $H_{2}S(g)$, will turns lead acetate paper
black
$S{O}_3{}^{2-}$ will give $S{O}_2(g)$, which will turns acidified potassium dichromate solution green.
$N{O}_2{}^{-}$will give brown $N{O}_2(g)$ will turn $KI$ solution blue.