A) During roasting, moisture is removed from the ore
B) The ore is freed from almost all non-metallic impurities
C) Calcination of ore is carried out in the absence of any blast of air
D) The concentrated zinc blende is subjected to calcinatioh during its extraction by pyrometallurgy
Correct Answer: D
Solution :
In pyro metallurgy of \[Zn\], \[ZnS\] is subjected to roasting.
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