In zone refining method, the molten zone : \( \mathrm{P} \) (a) contains impurities W (b) contai...

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In zone refining method, the molten zone :
\( \mathrm{P} \)
(a) contains impurities
W
(b) contains purified metal only
(c) contains more impurity than the original metal
(d) moves to either side
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