The hydroxide, which is soluble in excess of sodium hydroxide is:

F e (O H)_{3}

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C u (O H)_{2}

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C r (O H)_{3}

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A l (O H)_{3}

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Solution

The correct option is C $A l (O H)_{3}$
Aluminium hydroxide is insoluble in $H_{2} O$ but it is soluble in strong acids and strong bases. This is because of $A l (O H)_{3}$ its amphoteric nature.
$A l (O H)_{3} + N a O H \to N a [A l (O H)_{4}]$

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The hydroxide of which metal ion is soluble in excess of sodium hydroxide solution.

N H_{4} C l

Identify the hydroxide which is soluble in excess of NaOH

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A l (O H)_{3}

N H_{4} O H

N H_{4} C l

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