The catalyst used in the oxidation of ${S O}_{2}$ to ${S O}_{3}$ is_________.

Glycerine

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Nickel

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Manganese dioxide

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Platinised asbestos

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Solution

The correct option is C Platinised asbestos
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 $450^{0}$ C.
$S O_{2} + O_{2} \to 2 S O_{3}$
So answer is D.

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