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${BaCl}_{2}$ solution gives a white precipitate with a solution of a salt, which dissolves in dilute hydrochloric acid with the evolution of colourless pungent smelling gas. The gas as well as the salt both are used as bleaching agent in the textile industries. The salt contains:

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carbonate

sulphite

sulphide

acetate

answer is A.

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Detailed Solution

The reaction is,

${BaCl}_{2} + H_{2} {SO}_{3} \to {BaSO}_{3} + 2 HCl$

White ppt makes up this barium sulphite.
The acid radical in the equation could

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

On dissolving in $HCI$ solution

${BaSO}_{3} + 2 HCl \to {BaCl}_{2} + {SO}_{2} + H_{2} O$

${SO}_{2}$ gas emits a strong odour.

Here the salt contains is sulphite.

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