A) annealing
B) roasting
C) galvanization
D) smelting
Correct Answer: C
Solution :
Key Idea: Define all the processes and then find the correct answer. Annealing: It is the process of heating steel to red hot followed by slow cooling. Roasting: It is process of converting sulphide ore into oxide by heating in free supply of air. Galvanization: The process of coating iron with zinc is known as galvanization. It prevents rusting. Smelting: In this process calcinated or roasted ore is heated with coke powder and flux.
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