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Question

Let the solubilities of AgCl in H2O; 0.01M CaCl2; 0.01M NaCl and 0.05M AgNO3 be s1,s2,s3 and s4 respectively. What is the correct relationship between these quantities?

A
s1>s2>s3>s4
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B
s1>s2=s3>s4
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C
s1>s3>s2>s4
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D
s4>s2>s3>s1
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Solution

The correct option is B s1>s3>s2>s4
Solubility of AgCl inwater =Ksp=s1

In 0.01M CaCl2, it is given by
Ksp=s×(0.01×2+s) (s2=Ksp0.02)

In 0.01M NaCl, it is given by
Ksp=s×(0.01+s) (s3=Ksp0.01)

In 0.05M AgNO3, it is given by
Ksp=s×(0.05+s) (s4=Ksp0.05)
The solubilities are derived by neglecting s in comparison to 0.02,0.01 and 0.05.

So order is:
s1>s3>s2>s4

Option C is correct.

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