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Oxides and Oxoanions

Which one of ...

Question

Which one of the following metallic hydroxides does not dissolve in sodium hydroxide solution?

A

Z n (O H)_{2}

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B

A l (O H)_{3}

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C

F e (O H)_{3}

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D

P b (O H)_{2}

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Solution

The correct option is D $F e (O H)_{3}$
$F e (O H)_{3}$ is insoluble in sodium hydroxide solution. Rest hydroxides are soluble as they react with sodium hydroxide solution to form complex salt.

Example: $Z n (O H)_{2} + 2 N a O H \to N a_{2} [Z n (O H)_{4}]$

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