(i) The method of refining to obtain low boiling metal like Hg, Zn, Cd is distillation. On evaporating, pure metal distills over and then collected.
(ii) Role of pine oil in froth floatation is that it acts as froth collector. Froth carries mineral particles to surface while the impurities settle down. The froth is then skimmed off.
(iii) The entropy of a metal is higher in its liquid state than in its solid state. If ΔS is positive, on increasing the temperature (T), the value of TΔS would increase (ΔH < TΔS) and then ΔG will become negative and the reaction becomes feasible.
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