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Question

The specific conductance of saturated solution of CaF2 is 3.86×105 ohm cm1 and that of water used for solution is 0.15×105. The specific conductance of CaF2 alone is:

A
3.71×105
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B
4.01×105
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C
3.7×104
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D
3.86×104
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Solution

The correct option is A 3.71×105
k (CaF2 solution)=3.86×105 Ω1cm1
k (water solution)=0.15×105 Ω1cm1
k (CaF2 alone)=?
k (CaF2 alone)=k (CaF2 solution)k (Water solution)
=(3.860.15)×105Ω1cm1
=3.71×105 Ω1cm1
The specific conductance of CaF2 alone is 3.71×105 Ω1cm1

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