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Question:

The volume (in ml) of 0.1 M AgNO3 required for complete precipitation of chloride ions present in 30 ml of 0.01 M solution of [Cr(H2O)5Cl]Cl2, as silver chloride, is close to:

7

6

8

9

Solution:

Number of ionisable Cl- in [Cr(H2O)5Cl]Cl2 is 2.∴ Millimoles of Cl- = 30 × 0.01 × 2 = 0.6∴ Millimoles of Ag+ required = 0.6Now, 0.6 = V (in ml) × 0.1or, V = 6 ml.So, the correct option is 6