What would be conductivity of MX2 if conductivity of X- and ​M2+is5ohm−1cm2mol−1and6ohm−1cm2mol−1 respectively?
A
10ohm−1cm2mol−1
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B
11ohm−1cm2mol−1
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C
14ohm−1cm2mol−1
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D
17ohm−1cm2mol−1
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Solution
The correct option is D17ohm−1cm2mol−1 the value of equivalent conductance at infinite dilution for any electrolyte is the sum of contribution of its constituent ions. ∧∘m(MX2)=∧∘m(M2+)+2∧∘m(x−)=(5+2×6)ohm−1cm2mol−1=17ohm−1cm2mol−1 So conductivity of MX2=(5+2∗6)ohm−1cm2mol−1 =17ohm−1cm2mol−1