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JEE Main levelSingle correct optionDifficulty 2 of 3mt176

In zone refining, the distribution coefficient of an impurity is defined as $k = C_{solid} / C_{liquid}$ . For an impurity with $k < 1$ , the impurity ends up

Ain the middle of the rod
Bat the end where the heater starts
Cat the end of the rod where the heater finishes, which is cut off
Duniformly along the rod

Answer: C

With

k < 1

the freezing solid rejects the impurity into the liquid. The molten zone therefore carries the impurity forward and deposits it at the last part to freeze, the far end. That end is discarded.

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