A) roasting
B) cupellation
C) poling
D) electrolytic reduction
Correct Answer: A
Solution :
Roasting process: The concentrated ore is roasted at about 1200 K in excess of air when ZnS or anhydrous \[\text{ZnS}{{\text{O}}_{\text{4}}}\] formed by its oxidation changes to zinc oxide. \[2ZnS+3{{O}_{2}}\xrightarrow{{}}2ZnO+2S{{O}_{2}}\] \[Zn+2{{O}_{2}}\xrightarrow{{}}ZnS{{O}_{4}}\] \[2ZnS{{O}_{4}}\xrightarrow{{}}2ZnO+2S{{O}_{2}}+{{O}_{2}}\]
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