Question

Zone refining is based on the principle of that the impurities tend to be in the melt than in the solid metal.

• A. True
• B. False

Answer 1

The correct option is A

True

Metals like silicon Gallium and Germanium which are already very pure are subjected to Zone Refining or Fractional crystallization. This process reduces the impurity to ppm level;it is based on the principle that the impurities tend to stay in the melt. On solidification, pure metal solidifies just ahead of the surface of the melt.