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Account for the following facts: (a) T...

Account for the following facts:
(a) The reduction of a metal oxide is easier if the metal formed is in the liquid state at the temperature of reduction.
(b) Limestone is used in the manufacture of pig iron from haematite.
(c) Pine oil is used in the froth flotation process used to concentrate sulphide ores.

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(a) By `DeltaG=DeltaH-TDeltaS`.
(b) Limestone provides the flux (CaO).
(c) Pine oil (collector) enchances the non-wettability of the ore particles.
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