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An inorganic compound A is dissolved in ...

An inorganic compound A is dissolved in dilute hydrochloric acid and is then warmed. A colourless gas B is produced. When a filter paper moistened with potassium iodate and the strach solution is exposed to the gas it turns blue. The gas B and the compound A are:

A

`SO_(2)` and `Na_(2)SO_(3)`

B

`SO_(3)` and `Na_(2)SO_(4)`

C

`H_(2)S` and `Na_(2)S`

D

`H_(2)S` and `Na_(2)SO_(3)`

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The correct Answer is:
A
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