Question

A low boiling point metal contains high boiling point metal as impurity. The correct refining method is

• A. Liquation
• B. Distillation
• C. Poling
• D. Vapour phase refining

Hint:

Distillation is effective when the boiling points of the components are significantly different.

Answer 1

The Correct Option is B

Distillation is a separation technique based on differences in boiling points. In this case, since the metal has a low boiling point and the impurity has a high boiling point, distillation is the appropriate method. The low boiling point metal will vaporize, leaving the high boiling point impurity behind. Liquation is used to separate metals with low melting points from those with higher melting points. Poling is used to purify metals that contain metal oxides as impurities. Vapour phase refining is used to purify metals by converting them into a volatile compound, which is then decomposed to give the pure metal.