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Question

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

A
H2S
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B
SO2
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C
Both A and B
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D
None of the above
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Solution

The correct option is D SO2
When metal sulphite reacts with dilute acid-

Na2SO3+2HCl2NaCl+H2O+SO2

Option B is correct.

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