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Q.

Oxides of sulphur (SO2, SO3) are due to

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a

burning of sulphur containing fossil fuel

b

roasting and smelting of sulphide ore

c

oxidation by air, H2O2 and O3

d

All of the above

answer is D.

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Detailed Solution

a  S in fossil fuel  + O2 →   SO2b 2CuFeS2 + 112O2 →RoastingSmelting Cu2O + 2FeO + 4SO2c SO2 +  H2O2 →   H2SO4 aq.SO2 + O3 →   SO3 +O2
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