Copper turnings and concentrated are used in the preparation of sulphur dioxide.

sulphuric acid

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sulphurous acid

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sulphonic acid

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Solution

The correct option is A sulphuric acid
The reaction of concentrated sulphuric acid with copper turnings yields copper sulphate, sulphur dioxide and water.
$C u + 2 H_{2} S O_{4} h e a t - -- \to C u S O_{4} + S O_{2} + 2 H_{2} O$
The liberated sulphur dioxide is collected in the jar by the upward displacement of air.

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