Name one metal that reacts explosively with cold water to liberate hydrogen.

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Solution

In the periodic table, the most reactive ones are alkali metals.
Sodium $(Na)$ violently reacts with water and the reaction is exothermic.
Due to the heat emitted the hydrogen evolved during the reaction and immediately catches fire.
The reaction is as follows:
$\underset{Sodium}{2 Na (s)} + \underset{Water}{2 H_{2} O (l)} \to \underset{Sodium hydroxide}{2 NaOH (aq)} + \underset{Hydrogen}{H_{2} (g)} + Heat$

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