A) Poling; of more affinity towards oxygen for impurities
B) Selective oxidation; of more affinity towards oxygen for impurities
C) Electrolytic refining; impurities undissolved in electrolyte
D) Liquation; Sn having low melting point compared to impurities.
Correct Answer: D
Solution :Liquation is the principle based on difference in melting points.
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