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Oxides of Sulphur

Which of the ...

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:
$S O_{2} + 2 H_{2} S ⟶ 3 S + 2 H_{2} O$

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