A colourless salt gives white ppt with ${C a C l}_{2}$ solution and can also decolourise ${M n O}_{4}^{-} / H^{+}$ . Salt is decomposed by conc. $H_{2} {S O}_{4}$ forming gases :

{C O}_{2}, {S O}_{2}

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C O, {C O}_{2}

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C O, {S O}_{2}

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N_{2}, C O, {C O}_{2}

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Solution

The correct option is B $C O, {C O}_{2}$
The colourless salt contains oxalate ions.
Oxalate ions react with calcium chloride to form white ppt of calcium oxalate.
$C a C l_{2} + C_{2} O_{4}^{2 -} \to C a C_{2} O_{4} + 2 C l^{-}$

Oxalate ions can decolourize acidified ppermanganate solution.
$2 M n O_{4}^{-} + 5 C_{2} O_{4}^{2 -} + 16 H^{+} \to 2 M n^{2 +} + 10 C O_{2} + 8 H_{2} O$

Oxalate ions are decomposed by sulphuric acid to form CO and carbon dioxide.
$C_{2} O_{4}^{2 -} + H_{2} S O_{4} \to S O_{4}^{2 -} + H_{2} O + C O + C O_{2}$

Option B is correct.

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