Eco-friendly reagent that can be used instead of $H_{2} S$ is :

{N a}_{2} S

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({N H}_{4})_{2} {C S}_{3}

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({N H}_{4})_{2} S_{2}

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S_{8}

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Solution

The correct option is B $({N H}_{4})_{2} {C S}_{3}$
Thiourea, $({N H}_{4})_{2} {C S}_{3}$ is a source of sulphide ions.It is eco-friendly reagent that can be used instead of $H_{2} S$ .

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