Assertion : $[C o (N H_{3})_{5} B r] S O_{4}$ gives white precipitate with barium chloride. Reason: The complex $[C o (N H_{3})_{5} B r] S O_{4}$ dissociates in the solution to give $B r^{-} a n d S O_{4}^{2 -}$

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 C Assertion is correct but Reason is incorrect
The complex $[C o (N H_{3})_{5} B r] S O_{4}$ dissociates to give $[C o (N H_{3})_{5} B r]^{2 +}$ and $S O_{4}^{2 -}$ ions. $[C o (N H_{3})_{5} B r]^{2 +}$ does not dissociate in aqueous solution so $B r^{-}$ is not obtained. $S O_{4}^{2 -}$ ion reacts with barium chloride to give white precipitate of $B a S O_{4}$ .
$S O_{4}^{2 -} + B a C l_{2} \to B a S O_{4} ↓ + 2 C l^{-}$

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