A salt on reaction with dil. $H_{2} S O_{4}$ produces a colourless gas which turns lime water milky and an acidified orange coloured potassium dichromate solution green. The salt may be:

a carbonate

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a sulphite

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a sulphide

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an acetate

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Solution

The correct option is B a sulphite
The salt is sulphite. When the salt reacts with sulphuric acid, sulphur dioxide gas is liberated.
$S O_{3}^{2 -} + 2 H^{+} \to S O_{2} ↓ + H_{2} O$
This gas when reacts with lime water, turns milky.
$S O_{2} + C a (O H)_{2} \to C a S O_{3} ↓ (w h i t e) + H_{2} O$
And, when it reacts with an acidified orange colored potassium dichromate, solution turns green due to the formation of chromium ions.
$C r_{2} O_{7}^{2 -} + 2 H^{+} + 3 S O_{2} \to C r^{3 +} + 3 S O_{4}^{2 -} + H_{2} O$

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A salt on reaction with dil. H2SO4 produces a colourless gas which turns lime water milky and an acidified orange coloured potassium dichromate solution green. The salt may be:

A salt on reaction with dil. $H_{2} S O_{4}$ produces a colourless gas which turns lime water milky and an acidified orange coloured potassium dichromate solution green. The salt may be: