When sodium hydroxide reacts with aluminium metal:

sodium aluminate and water gas are formed

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sodium aluminate and hydrogen gas are formed.

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Solution

The correct option is B sodium aluminate and hydrogen gas are formed.
Sodium aluminate and hydrogen gas are formed when sodium hydroxide reacts with aluminium metal.
$2 N a O H + 2 A l + 2 H_{2} O \to 2 N a A l O_{2} + 2 H_{2}$
Option B is correct.

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