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Solution - Explain: Zone Refining - CBSE (Science) Class 12 - Chemistry


Explain: Zone refining

Outline the principles of refining of metals by the following methods

Zone refining


Zone refining: This method is based on the principle that impurities are more soluble in the molten state of metal (the melt) than in the solid state. In the process of zone refining, a circular mobile heater is fixed at one end of a rod of impure metal. As the heater moves, the molten zone of the rod also moves with it. As a result, pure metal crystallizes out of the melt and the impurities pass onto the adjacent molten zone. This process is repeated several times, which leads to the segregation of impurities at one end of the rod. Then, the end with the impurities is cut off. Silicon, boron, gallium, indium etc. can be purified by this process.

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 NCERT Chemistry Textbook for Class 12 Part 1 (with solutions)
Chapter 6: General Principles and Processes of Isolation of Elements
Q: 4.1 | Page no. 163

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Solution for question: Explain: Zone Refining concept: Refining. For the courses CBSE (Science), CBSE (Arts), PUC Karnataka Science, CBSE (Commerce)