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प्रश्न
Sulphuric acid is manufactured by contact process.
write the main reactions of this process.
उत्तर
Main reactions of this process are:
S + O2 → SO2
2SO2 + O2 
2SO3
SO3 + H2SO4 → H2S2O7
H2S2O7 + H2O → 2H2SO4
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Manufacture of Sulphuric Acid (Constant Process)
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