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Nitrates

A metal nitra...

Question

A metal nitrate on reaction with excess sodium hydroxide solution gives a white precipitate but it rapidly turns brown on adding bromine water. Aqueous solution of metal nitrate produces a pink precipitate with disodium hydrogen phosphate solution in the presence of ammonia. The cation is:

A

C u^{2 +}

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B

M n^{2 +}

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C

M g^{2 +}

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D

Z n^{2 +}

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Solution

The correct option is B $M n^{2 +}$
Manganese nitrate reacts with excess sodium hydroxide to form a white precipitate of manganese hydroxide. This precipitate is insoluble in excess $N a O H$ . The reaction is given below:
$M n^{2 +} + 2 O H^{-} \to M n (O H)_{2} ↓$
When bromine water is added, brown precipitate of $M n O (O H)_{2}$ is obtained.
$M n (O H)_{2} + [O] B r_{2} (w a t e r) - ----- \to M n O (O H)_{2} ↓ (b r o w n)$
On reaction with disodium hydrogen phosphate solution in the presence of ammonia, manganese nitrate forms a pink precipitate of $M n (N H_{4}) P O_{4}$ .
$M n^{2 +} + N H_{3} + H P O_{4}^{2 -} \to M n (N H_{4}) P O_{4} ↓ (p i n k)$
Hence, the cation is $M n^{2 +}$ .

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