InterviewSolution
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InterviewSolution
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India has no deposits of sulphur. However, large deposits of gypsum occur in india. How can you obtain `SO_2` from gypsum quantitative?A. by heating anhydrous gypsum to `1200^(@)`C aloneB. by heating anhydrous gypsum with coke to `1200^(@)`CC. by treating gypsum with conc. `HNO_3` at `700^(@)`CD. none of these |
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Answer» Anhydrous gypsum `(CaSO_4)` when heated `1200^(@)`C decomposes slightly. `2CaSO_4overset(1200^(@)C)iff2CaO+2SO_2+O_2` However, to get quantitative yield of `SO_2` anhydrous gypsum is heated with coke, when calcium sulphide is first formed. `CaSO_4+2CtoCaS+2CO_2uparrow` On heating further to `1200^(@)`,calcium sulphide reacts with `CaSO_4` to give `SO_2` `CaS+3CaSO_4iff2CaO+4SO_2uparrow` |
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