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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 sodium metal to water catches fire. Why is it so?

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When sodium reacts with water, the reaction is highly exothermic and the amount of heat evolved is sufficient for hydrogen gas to catch fire. Hence, hydrogen evolved catches fire. In case of calcium, the heat evolved during the reaction is not sufficient for hydrogen gas to catch fire.
`Ca + 2H_(2)O to Ca(OH)_(2) + H_(2) +` heat
`2Na + 2H_(2)O to 2NaOH + H_(2) +` heat
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