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Question

The catalyst used in the oxidation of SO2 to SO3 is_________.
  1. Nickel
  2. Manganese dioxide
  3. Platinised asbestos
  4. Glycerine

A
Glycerine
B
Nickel
C
Platinised asbestos
D
Manganese dioxide
Solution
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Sulphur trioxide is prepared by passing oxygen and sulphur dioxide through concentrated sulphuric acid to dry the gases, which are then passed over a heated platinised asbestos catalyst at 4500C.

SO2+O22SO3

So answer is D.

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