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When calcium metal is added to water, th...

When calcium metal is added to water, the gas evolved does not catch fire but the same gas evolved on adding potassium metal to water catches fire. Explain why?

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In both cases, the gas evolved is `H_2`. When calcium reacts with water the heat evolved is not sufficient for hydrogen to catch fire. On the other hand, potassium reacts with water violently and lot of heat is evolved which is sufficient for hydrogen to catch fire.
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