What do you observe when $H_{2} S$ gas is passed through cadmium chloride solution? Name the type of reaction:

Synthesis

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Displacement

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Double displacement

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Neutralisation

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Solution

The correct option is A Double displacement
When $H_{2} S$ gas i.e. hydrogen sulphide gas is passed through cadmium chloride solution, yellow colored precipitate of cadmium sulphide (CdS) is formed and aqueous hydrochloric acid (HCl) is formed.
$H_{2} S (g) + C d C l_{2} (a q) \to C d S (s) + 2 H C l (a q)$

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