State True or False.
Addition of $N H_{4} C l$ can precipitate $A l (O H)_{3}$ from soluble $N a [A l (O H)_{4}]$ .

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Solution

$N H_{4} C l$ solution is acidic due to hydrolysis: $N H_{4} C l + H_{2} O ⇌ N H_{4} O H + H C l$ . Hence, addition of $N H_{4} C l$ solution precipitates $A l (O H)_{3}$ when added to $N a A l (O H)_{4}$ $N a [A l (O H)_{4}] + H C l \to N a C l + A l (O H)_{3} ↓ + H_{2} O$

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