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Question

Which of the following oxides are used in the formation of elemental sulfur from hydrogen sulfide?

A
Sulfur trioxide
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B
Sulfur dioxide
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C
Sulfur oxide
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D
Selenium dioxide
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Solution

The correct option is B Sulfur dioxide
Sulfur dioxide is the oxidising agent in the Claus process, which is conducted on a large scale in oil refineries. Here, sulfur dioxide is reduced by hydrogen sulfide to give elemental sulfur:
SO2+2H2S3S+2H2O

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