Aluminium hydroxide is soluble in excess of sodium hydroxide forming the ion

Question

Aluminium hydroxide is soluble in excess of sodium hydroxide forming the ion (A)  AlO3-  (B)  AlO23+  (C)  AlO23-  (D)  AlO2-

Tardigrade Admin · Accepted Answer

A l O_{2}^{-}

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A l (O H)_{3} + excess N a O H ⟶ < b r / > sodium meta aluminate N a A l O_{2} + 2 H_{2} O

N a A l O_{2} ⇌ N a^{+} + A l O_{2}^{-}

Z n C l_{2} + 2 N a O H ⟶ white ppt. Z n (O H)_{2}

N a O H sodium zincate N a_{2} Z n O_{2}

N a_{2} Z n O_{2} ⇌ 2 N a^{+} + Z n O_{2}^{2 -}

S n C l_{2} + 2 N a O H ⟶ white ppt. S n (O H)_{2}

N a O H sodium stannite N a_{2} S n O_{2}

Q. Aluminium hydroxide is soluble in excess of sodium hydroxide forming the ion