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When salt A reacts with dilute HCl, it produces pungent gas B. If gas B is passed through alkaline sodium nitroprusside solution then purple solution C is produced. Identify A?

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${CO}_{3}^{2 -}$

$S_{2} O_{3}^{2 -}$

${SO}_{3}^{2 -}$

$S^{2 -}$

answer is D.

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Detailed Solution

In an alkaline solution containing sulfide ions, the addition of sodium nitroprusside results in the production of the purple sodium trio nitroprusside complex.

The reaction is as follows:

Metal + Acid → Salt + Hydrogen gas

$2 N a (s) + 2 H C l (a q) \to 2 N a C l (a q) + H_{2} (g)$

Hence, the correct option is D.

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