Assertion :On adding dilute hydrochloric acid to the reaction mixture, white precipitate disappears. Reason: $B a S O_{3}$ is a salt of a weak acid $(H_{2} S O_{3})$ , therefore dilute acid such as $H C l$ decomposes barium sulphite to produce sulphur dioxide gas which has the smell of burning sulphur.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Dilute hydrochloric acid $(H C l)$ decomposes barium sulphite to form barium chloride ( $B a C l_{2}$ ) , sulphur dioxide ( $S O_{2}$ ) and water ( $H_{2} O$ ). Since barium chloride is soluble in water, thus white precipitate disappears.
$B a S O_{3} + 2 H C l \to B a C l_{2} + S O_{2} + H_{2} O$

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