JEE Main Chemistry question

Chemistry General Principles and Processes of Isolation of Elements (Metallurgy)JEE Main

Not in JEE Main or NEET syllabus

The method of zone refining of metals is based on the principle of [UP SEE 2007]

(A)Greater noble character of the solid metal than that of the impurity
(B)Greater solubility of the impurity in the molten state than in the solidCorrect
(C)Greater mobility of the pure metal than that of impurity
(D)Higher melting point of the impurity than that of the pure metal

Answer: (B)

Solution

In zone refining, a molten zone is passed along a rod; impurities are more soluble in the melt than in the solid, so they concentrate in and move with the molten zone, leaving purer solid metal

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Question ID VK-138266