In zone refining method, the molten zone : \( \mathrm{P} \) (a) consists of impurities only W. (...

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