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Question

The precipitate of CaF2(Ksp=1.7×1010) is obtained when equal volumes of the following are mixed :

A
104MCa2++104MF
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B
102MCa2+103MF
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C
105MCa2+103MF
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D
103MCa2+105MF
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Solution

The correct option is D 102MCa2+103MF
Ip=[Ca2+][F]2>Ksp for precipitate formation.

Now,

Ip=[Ca2+][F]2=102×(103)2=108>Ksp

Precipitation happens in B option.

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