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What happens when calcium and potassium are put in water?

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When a metal reacts with water, then metal hydroxide and hydrogen is formed.
Reaction of calcium with water :-
When calcium metal is put in the water, then calcium hydroxide and hydrogen gas is produced.
Reaction of potassium with water :-
When potassium is put in water, it reacts vigorously to produce potassium hydroxide, hydrogen gas and some amount of heat.

Final answer :-
Hence,this is the answer to what happens when calcium and potassium are put in water.

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