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Kalevi

when calcium metal is added to water the gas evolved dose not catch fire but the same gas evolved on adding sodium Metal to water catches fire. why is it so ? ​

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Solution. Sodium is more reactive than calcium. The reaction between sodium and water produces a large amount of heat, which causes the evolved hydrogen to burn and catch fire. But in the reaction between calcium and water, no heat is produced and hence the evolved hydrogen does not catch fire.

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