Semiconductor of very high purity can be obtained by zone refining. Explain the principle behind zone refining.

Which is false about zone refining?

The method of zone refining of metals is based on the principle of

In zone refining method, the molten zone.

Explain the method of refining copper.

A patient with renal failure in waiting for a kidney donor for a transplantation operation. The urea level is high and the patient is developing symptoms of uremia. What method you can suggest to keep the patient live till a donor can be found. Explain the principle behind it.

Outline the principles of refining of metals by the following methods.Zone refining.