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Properties & Uses of Aluminium

Name the gas ...

Question

Name the gas in each of the following:
The gas evolved on reaction of aluminium with boiling concentrated caustic alkali solution

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Solution

Metal aluminate is formed and hydrogen gas is liberated. For example, on reation with sodium hydroxide, sodium aluminate is formed.
$2 A l + 2 N a O H + 2 H_{2} O \to 2 N a A l O_{2} + 3 H_{2}$

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