Which of the following metal catch fire on reaction with air?

Calcium

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Potassium

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Magnesium

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Manganese

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Solution

The correct option is B Potassium
Sodium and potassium both are extremely reactive and react with air as well as water vigorously. The reactions are highly exothermic and hence, the hydrogen gas evolved as byproduct catches fire.

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Which of the following metal catches fire when reacts with water?

Which of the following metals on reaction with water releases hydrogen gas?

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