Q99 of 400 Page 136

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?

when sodium metal reacts with water more amount of heat is evolved at the time of reaction due to which hydrogen gas catches fire. While on the other hand during the reaction of calcium and water the evolved heat is not that much so that it may cause the hydrogen gas to burn.

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(i) It does not react with cold as well as hot water but reacts with steam.


(ii) It does not react with any physical state of water.

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(a) by the sharing of electrons between two atoms?


(b) by the transfer of electrons from one atom to another?