In what ratio does sulphur and oxygen need to be added in order to increase the yield of SO₂ in the contact process?

1:2

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2:1

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3:2

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4:3

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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 where excess oxygen increases the yield of SO₂.

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