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Question

In which stage of the contact process is Oleum (H2S2O7) obtained?

A
First stage in the burner
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B
Second stage in the converter
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C
Third stage in the absorption tower
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D
Fourth stage in the dilution tank
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Solution

The correct option is C Third stage in the absorption tower
Oleum (H2S2O7) is a mixture of sulphuric acid and sulphurous acid. It is obtained in the third stage of contact process when Sulphur trioxide SO3 is absorbed by sulphuric acid (H2SO4) in the absorption tower.

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