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Q. No.The method of zone refining of metals is based on the principle of:
| 1. | Greater mobility of the pure metal than that of the impurity |
| 2. | Higher melting point of the impurity than that of the pure metal |
| 3. | Greater noble character of the solid metal than that of the impurity |
| 4. | Greater solubility of the impurity in the molten state than in the solid |
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Subtopic: Â Refining Process |
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