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Question

The Ksp of Ag2CrO4, AgCl, AgBr and AgI are respectively, 1.1×1012,1.8×1010,5.0×1013,8.3×1017. Which one of the following salts will precipitate last if AgNO3 solution is added to the solution containing equal moles of NaCl, NaBr, NaI and Na2CrO4?

A
AgCl
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B
AgBr
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C
Ag2CrO4
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D
AgI
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Solution

The correct option is C Ag2CrO4
Ag2Cr2A+g+CrO24
1 0 0

1-s 2s s

Ksp=(2s)2s1s, s< < 1

=1.1×1012=4s3

=s=6.5×105

AgClAg++Cl

s s

1.8×1010=s2

=s=1.34×105

silmilarly s for AgBr and AgCl is 7.1×107 and 9×109 respectively since solubility of Ag2CrO4 is lighest, sa it will perticipate lost.


Option C) Ag2CrO4 is correct option

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