(a) Name a metal for each case :(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.(b) When calcium metal is added to water, the gas evolved does not catch fire but the same gasevolved on adding sodium metal to water catches fire. Why is it so ?

(a) Name a metal for each case :(i) It does not react with cold as wel

1.	(a) Name a metal for each case :(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.(b) When calcium metal is added to water, the gas evolved does not catch fire but the same gasevolved on adding sodium metal to water catches fire. Why is it so ?
Answer» Solution : (a) (i) Al, Fe and Zn do not react with cold as well as hot water but react with STEAM. (II) Lead, copper, silver, gold, etc., do not react with any physical state of water. (b) The reaction of calcium with water is less VIOLENT. The heat EVOLVED is not sufficient for hydrogen gas evolved to catch fire.