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Question

What would be conductivity of MX2 if conductivity of X- and ​M2+is 5 ohm−1cm2 mol−1 and 6 ohm−1cm2 mol−1 respectively?

A
10ohm1cm2mol1
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B
11ohm1cm2mol1
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C
14ohm1cm2mol1
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D
17ohm1cm2mol1
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Solution

The correct option is D 17ohm1cm2mol1
the value of equivalent conductance at infinite dilution for any electrolyte is the sum of contribution of its constituent ions.
m(MX2)=m(M2+)+2m(x)=(5+2×6)ohm1 cm2 mol1=17ohm1 cm2 mol1
So conductivity of MX2 =(5+26)ohm1cm2 mol1
=17ohm1cm2 mol1

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