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Question

Equivalent conductivity at infinite dilution for sodium-potassium oxalate ((COO)2Na+K+) is :

Given : Molar conductivities of oxalate is 73.5 S cm2mol1, K+ and Na+ ions at infinite dilution are 148.2, 50.1 S cm2mol1 respectively.

A
271.8 S cm2eq1
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B
67.95 S cm2eq1
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C
543.6 S cm2eq1
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D
135.9 S cm2eq1
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Solution

The correct option is D 135.9 S cm2eq1
λM=λM(Oxalate)+λM(NA+)+λM(K+)

λM=(148.+50.1+73.5)Scm2mol1

λM=271.8Scm2mol1

λEq=271.82=135.9Scm2eq1(λeq=λMn.factor)

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