Why Potassium and cold water are not used to prepare Hydrogen in the laboratory?

The reaction is violent and exothermic

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Potassium do not react with cold water

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Reaction is reversible

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The liberated heat ignites the hydrogen

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Solution

The correct options are
A The liberated heat ignites the hydrogen
C The reaction is violent and exothermic
Chemical reaction $2 K + 2 H_{2} O ⟶ 2 K O H + H_{2}$ reaction is highly exothermic.
This heat burns the hydrogen gas as well as potassium metal.
The burning of hydrogen gas can cause a little explosion.

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