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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

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False

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Solution

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.


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