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Preparation from Cold Water and Metals

Which of the ...

Question

Which of the following reacts most vigorously with cold water?

A

Potassium (K)

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B

Sodium (Na)

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C

Calcium (Ca)

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D

Magnesium (Mg)

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Solution

The correct option is A
Potassium (K)

Potassium (K) reacts most vigorously with cold water and hydrogen gas produced as a result of it immediately catches fire and burns with lilac coloured flame because of the presence of potassium vapours in it. Order of reactivity with water is K > Na > Ca > Mg etc.

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