Which among the following substances is one of the key component for the industrial preparation of sulphuric acid by contact process?

Sulphur dioxide

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Sulphur pentoxide

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Nitric oxide

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Sulphur monoxide

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Solution

The correct option is A Sulphur dioxide
Sulphuric acid is prepared industrially by the 'Contact process'. In this process, sulphur dioxide formed during burning of fossil fuels is the key compound for the laboratory preparation of sulphuric acid.

Sulphur is burnt in air to give sulphur dioxide. The equation for the reaction is given below.
$S (s) + O_{2} (g) \to S O_{2} (g)$

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