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Question

The volume (in mL) of 1.0 M AgNO3 required for the complete precipitation of chloride ions present in 30 mL of 0.01M solution of [Cr(H2O)6]Cl3, as silver chloride is:

A
0.9
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B
1.0
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C
1.8
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D
2.0
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Solution

The correct option is A 0.9
[Cr(H2O)6]Cl3+3AgNO3[Cr(H2O)6](NO3)3+3AgCl
Because [Cr(H2O)6]Cl3 has 3 ionisable Cl ions.
We know that, M1V1=M2V2
M1 and M2, V1 and V2 are concentration and volume of [Cr(H2O)6]Cl3 and AgNO3 respectively.

Millimoles of Cl = 30 x 0.01 M x 3 = 0.9 M
So, volume of Ag+ required =0.9 x 1 = 0.9 mL


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