Question

metal like potassium nd sodium react violently with cold water

Answer 1

$<b><i>Hey frnd</i>$
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Preparation of Hydrogen from cold water :-
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Metals like Potasium and Sodium react violently with cold water and liberate Hydrogen gas along with their respective Hydroxides .

Eg - Na + H2O → NaOH + H
K + H2O → KOH + H
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@brishti892005

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Answer 2

It causes an explosion because the metal dissolves, generating an extreme amount of heat and transferring electrons to the water. The dissolution step also generates steam and forms hydroxide ions and hydrogen, which can be ignited, making the process even more energetic.

Some Researchers are puzzled about how these metals react violently.

Hope it Helps!!!