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. 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)

$CO _{3}{ }^{2-}$ will give $CO _{2}( g )$ which will turns lime water milky.
$S ^{2-}$ will give $H _{2} S ( g )$, will turns lead acetate paper
black
$SO _{3}{ }^{2-}$ will give $SO _{2}( g )$, which will turns acidified potassium dichromate solution green.
$NO _{2}{ }^{-}$will give brown $NO _{2}( g )$ will turn $KI$ solution blue.