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Q.

Which metal reacts most vigorously with water at 25∘C?

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a

Na

b

Mg

c

K

d

Ca

answer is C.

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Detailed Solution

Potassium metal reacts most vigorously with water at 25degreesCelcius.

Cold water and potassium (K) react most violently, and the hydrogen gas that results from this reaction instantly catches fire and burns with red-colored flame due to the presence of potassium vapours in it.

Water reactivity is in the following order: K > Na > Ca > Mg, etc.

Hence, option C is correct.

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