In the zone refining method,the molten zone:

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(B) Zone refining is based on the principle that impurities are more soluble in the molten state of the metal than in the solid state. As the heater m

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contains more impurity than the original metal

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(B) Zone refining is based on the principle that impurities are more soluble in the molten state of the metal than in the solid state. As the heater moves along the metal rod,the impurities dissolve into the molten zone. Consequently,the molten zone becomes enriched with impurities,meaning it contains more impurity than the original solid metal. As the molten zone moves forward,the pure metal crystallizes out,leaving the impurities behind in the molten zone.

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