The gas liberated when a dilute acid reacts with a metallic sulphite is ____________.

H_{2} S

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S O_{2}

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Both

A

and

B

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None of the above

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Solution

The correct option is D $S O_{2}$
When metal sulphite reacts with dilute acid-

$N a_{2} S O_{3} + 2 H C l \to 2 N a C l + H_{2} O + S O_{2}$

Option B is correct.

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