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Question

On adding 0.1 M solution each of [Ag+],[Ba2+],[Ca2+] in Na2SO4 solution, species first precipitated is:
[Ksp(BaSO4)=10−11, Ksp(CaSO4)=10−6 and Ksp(Ag2SO4)=10−5]

A
Ag2SO4
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B
BaSO4
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C
CaSO4
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D
All of these
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Solution

The correct option is B BaSO4
On adding 0.1 M solution each of [Ag+],[Ba2+],[Ca2+] in Na2SO4 solution, species first precipitated is BaSO4.
1. For BaSO4
KspBaSO4=[Ba2+][SO24]
1011=0.1×[SO24]
[SO24]=1010 M
2. For CaSO4
KspCaSO4=[Ca2+][SO24]
106=0.1×[SO24]
[SO24]=105 M
3. For Ag2SO4
KspAg2SO4=[Ag+]2[SO24]
105=(0.1)2×[SO24]
[SO24]=103 M
Thus, precipitation of BaSO4 will require least value of [SO24].

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