Zone refinning is a process in which

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A. a metalrod is dipped in a molten pool of liquid to dissolve slowly and the liquid is refined continuously

B. liquid metal is refined in the zone of electric arc in the DC arc furnace

C. a metal in the form of long rod is melted over a short length and molten region is made to traverse along the length of the rod

D. a long metal rod is cut into small parts and each part is melted and refined separately

Answer: Option C

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