$H_{2} S$ is used as laboratory reagent because sulphides are highly ______ .

insoluble

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soluble

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volatile

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separable

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Solution

The correct option is A insoluble
$H_{2} S$ reacts with most of the transition metals and it forms metal sulphides. In presence of $S^{2 -}$ ion, the ionic product of these metal sulphide salt is much higher than their solubility product. Thus solubility of those metal sulphides get decreased and it gets precipitated. So it is easy to separate after precipitation. Hence $H_{2} S$ is used widely as a laboratory reagent.

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H2S is used as laboratory reagent because sulphides are highly ______ .

$H_{2} S$ is used as laboratory reagent because sulphides are highly ______ .