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(i) Write the principle of vapour phase refining.

(ii) What is the role of depressant in froth floatation process?

(iii) Write the name of reducing agent to obtain iron from Fe2O3 at high temperature

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(i) Metal is converted into a volatile compound which on strong heating decomposes to give pure metal.

(ii) It selectively prevents one of the sulphide ore from coming to the froth.

(iii) Coke.

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