Question

In zone refining ______.

Options

• The impure metal rod is kept stationary and the heater ring is moved.

• The heater ring is kept stationary and the metal rod is moved.

• The impurities get accumulated at the centre of the rod.

• The impurities get accumulated at one end of the rod.

Answer 1

In zone refining the impure metal rod is kept stationary and the heater ring is moved, the impurities get accumulated at one end of the rod.

Explanation:

In the zone refining process, the impure metal rod is kept fixed, and a movable heater melts a small region of the rod. As the heater ring moves slowly along the rod, impurities concentrate in the molten zone and move with it, finally collecting at one end of the rod. The pure metal solidifies behind the heater.