Which of the following metals will react with alkali solution on heating and evolve hydrogen gas?

Zinc

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Aluminium

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Tin

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All of the above

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Solution

The correct option is D All of the above
Zinc, Aluminium and Tin will react with alkali solution on heating and evolve hydrogen gas. For example :
$Z n + 2 N a O H \to N a_{2} Z n O_{2} + H_{2}$
$2 A l + 2 N a O H + 2 H_{2} O \to 2 N a A l O_{2} + 3 H_{2} O$
$S n + 2 N a O H \to N a_{2} S n O_{2} + H_{2}$

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