What is the molar ratio of sulphur to oxygen added to produce sulphur dioxide in the contact process?

1:2

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2:1

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3:1

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1:3

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Solution

The correct option is A
1:2

In the first stage of the contact process, sulphur is burnt to form SO₂. Here, the ratio of sulphur to oxygen is 1:2.

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1 l i t

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S O_{2}

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