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(i) Name a method used for the refining ...

(i) Name a method used for the refining of zirconium.
(ii) What is the role of CO in the extraction of iron ?
(iii) Reduction of metal oxide to metal becomes easier if the metal obtained is in the liquid state. Why ?

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(i) Zirconium (Zr) is refined by Van Arkel method.
(ii) Co acts as a redcing agent in the extraction of iron.
(iii) As a result, `DeltaS` becomes more positive. Therefore, `DeltaG` becomes negative.
` DeltaG=DeltaH-TDeltaS`
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