Which of the following reacts most vigorously with cold water?

Potassium (K)

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Sodium (Na)

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Calcium (Ca)

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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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Which of the following reacts with cold water vigorously?

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