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Question

Which of the following metals are expected to form precipitate if sulphide ion concentration in their 0.01 M solution is made 1016 M?
(i) AS (Ksp of AS=1016)
(ii) BS (Ksp of BS=1021)
(iii) WS (Ksp of WS=1014)
(iv) C2S (Ksp of C2S=1018)
(v) D2S (Ksp of D2S=1021)

A
BS,C2S,D2S
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B
BS,C2S
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C
AS,WS
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D
BS,D2S
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E
BS,WS
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Solution

The correct option is A BS,D2S
From given values,

[AS]=[A+2[S2]=0.01×1016=1018<Ksp

[BS]=[B+2[S2]=0.01×1016=1018>Ksp

[WS]=[W+2[S2]=0.01×1016=1018<Ksp

[C2S]=[C+]2[S2]=0.012×1016=1020<Ksp

[D2S]=[D+]2[S2]=0.012×1016=1020>Ksp

So only BS and D2S will precipitate in solution.

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