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Question
Sulphuric acid is manufactured by the contact process.
Give two balanced equations to obtain \[\ce{SO2}\] in this process.
Solution
By burning sulphur in excess of air.
\[\ce{S + O2 -> SO2_{(g)}}\]
By roasting \[\ce{(FeS2)}\] iron Pyrites in excess of air
\[\ce{4FeS2 + 11O2 ->[][Roasting] 2Fe2O3 + 8SO2_{(g)}}\]
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