1.

Give the reason why copper is used to make hot water tanks but steel (an alloy of iron) is not.

Answer»

Solution :This is because IRON present in steel reacts with steam to form ferrosoferric oxide WHEREAS copper has no action with water. As a result of it, the body of the steel tank BECOMES weaker and weaker in case of iron and not in case of copper.
`3FE(s)+4H_(2)O(g)overset(DELTA)hArrunderset("Ferrosoferric oxide")(Fe_(3)O_(4)(s))+4H_(2)(g)`


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