Aluminium oxide reacts with hot concentrated solution of sodium hydroxide to form:

sodium aluminate

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aluminium hydroxide

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aluminium hydride

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sodium aluminate hydroxide

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Solution

The correct option is A
sodium aluminate

Aluminium oxide reacts with hot concentrated solution of sodium hydroxide to form sodium aluminate. The reaction involved is:

$A l_{2} O_{3} .2 H_{2} O (s) + 2 N a O H (a q) \to 2 N a A l O_{2} (a q) + 3 H_{2} O (l)$

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