Purity of gold is check in carrat 24 carrat is the purest gold it is 100% gold If 22 carrat then it means 22 parts gold and 2 parts is copper for the manufacturing of jewelley Mostly 21 carrat gold is used to make jewellry. Gold is a noble matel.
Fractional distillation: The seperation of differnet substances on the base of boiling points in the presence of oxygen. Petrolleum products ara seperate by fractional distillation. Destructive distillation: It is a process in which substances are heated in the limited supply of air.
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