A) in the presence of excess of air
B) in the presence of limited supply of air
C) pin the absence of air
D) in the presence of nitrogen
Correct Answer: A
Solution :
In the process of roasting the concentrated ore is strongly heated in the presence of excess of air. During roasting oxidation, chlorination, etc. takes place and impurity of S and As are removed as their volatile oxides. The sulphides ore changes to oxide. \[S+{{O}_{2}}\xrightarrow{{}}S{{O}_{2}}\] \[4As+3{{O}_{2}}\xrightarrow{{}}2A{{S}_{2}}{{O}_{3}}\] \[2ZnS+3{{O}_{2}}\xrightarrow{{}}2ZnO+2S{{O}_{2}}\] \[ZnS+2{{O}_{2}}\xrightarrow{{}}2nS{{O}_{4}}\]
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