Arsenic is toxic. Therefore its presence, if any, in a room has to be detected. Which of the following gases can detect arsenic by reacting with it?

Methane

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Fluorine

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Hydrogen sulphide

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Acetylene

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Solution

The correct option is C Hydrogen sulphide
Arsenic reacts with $H_{2} S$ to form Arsenic sulphide. So, $H_{2} S$ is used to detect Arsenic.
$H_{2} S + A s ⟶ A s_{2} S_{5} + H_{2}$
$A s_{2} S_{5}$ is a stable compound.

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Similar questions

Any arsenic present is removed by reacting the mixture with :

H_{2} S

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