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Introduction to Inorganic Chemistry

Yellow ammoni...

Question

Yellow ammonium sulphide can separate :

C d S

and

{A s}_{2} S_{3}

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{B i}_{2} S_{3}

and

C u S

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P b S

and

{B i}_{2} S_{3}

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H g S

and

P b S

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Solution

The correct option is A $C d S$ and ${A s}_{2} S_{3}$
Since $C d S$ belongs to IIA group and ${A s}_{2} S_{3}$ belongs to IIB group, they can be separated with yellow ammonium sulphide as only IIB group sulphides dissolve in yellow ammoium sulphide.

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Y A S

S n S

{A s}_{2} S_{3}

P b S, C u S, H g S, M n S, A g_{2} S, N i S, C o S, B i_{2} S_{3}

_{2}

{S b}_{2} S_{3}

S^{2 -}

{S b}_{2} S_{3}

H N O_{3}

B a S O_{4}, C u S, P b S, H g S

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