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On adding dilute hydrochloric acid to an...

On adding dilute hydrochloric acid to an aqueous solution of a salt and warming, a colourless gas with pungent odour is evolved along with the formation of a yellow ppt. this indicates the presence of ….. in the salt.

A

`SO_(4)^(2-)`

B

`SO_(3)^(2-)`

C

`S^(2-)`

D

`S_(2)O_(3)^(2-)`

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