Which of the following is a colourless gas having a choking smell of gun powder?

Silver sulphide

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Sulphur dioxide

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Phosphorous pentoxide

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Magnesium oxide

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Solution

The correct option is B
Sulphur dioxide

Sulphur dioxide is a colourless gas having a choking smell of gun powder.When a burning piece of sulphur is introduced into a gas-jar filled with oxygen it burns with a light blue flame.In this reaction, colourless sulphur dioxide gas having a choking smell of gun powder is formed.The chemical reaction is as follows:

$S + O_{2} \to S O_{2}$

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