NEET 2003 Chemistry question

Chemistry General Principles and Processes of Isolation of Elements (Metallurgy)NEET 2003

Not in JEE Main or NEET syllabus

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 solidCorrect

Answer: (4)

Solution

In zone refining a molten zone is moved along a rod of impure metal by a circular heater. The impurities are more soluble in the molten metal than in the solid, so they remain in the melt and are carried to one end of the rod while the pure metal

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Question ID VK-089198