Calcium sulphide yields the pure Hydrogen sulphide gas when treated with dilute:

hydrochloric acid

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sodium chloride

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nitric acid

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nitrous acid

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Solution

The correct option is A hydrochloric acid
If iron sulphide is used in the form of a mineral called pyrite it could contain some impurities of arsenic. For the preparation of arsenic-free hydrogen sulphide following procedure is used.

Calcium sulphide yields the pure gas when treated with dilute hydrochloric acid.
$C a S + 2 H C l \to H_{2} S + C a C l_{2}$ .
Hence option A is correct.

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