Which among the following cannot be used to generate $H_{2}$ ?

Al + NaOH

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Zn + NaOH

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Mg + NaOH

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LiH + H_{2} O

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Solution

The correct option is D $Mg + NaOH$
Magnesium reacts with sodium hydroxide to form magnesium hydroxide and sodium metal.
$M g + 2 N a O H ⟶ M g (O H)_{2} + 2 N a$

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