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Q.

Solubility product of silver bromide is 5.0 x 10-13. The quantity of potassium bromide (molar mass taken as 120 g mol-1) to be added to 1 litre of 0.05 M solution of silver nitrate to start the precipitation of AgBr is:

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a

5.0×10−8g

b

1.2×10−9g

c

1.2×10−10g

d

6.2×10−5g

answer is B.

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Detailed Solution

 Molarity =nKBrVSolution (L)1×10−11=wKBr/1201(Mol. wt. of KBr=120)

⇒wKBr=1×10−11×120=120×10−11              wKBr=1.2×10−9g

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