The equivalent conductance of Ba2+ and Cl− are respectively 127 and 76ohm−1cm2eq−1 at infinite dilution. What will be the equivalent conductance of BaCl2 at infinite dilution?
A
139.5ohm−1cm2eq−1
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B
203ohm−1cm2eq−1
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C
279ohm−1cm2eq−1
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D
101.5ohm−1cm2eq−1
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Solution
The correct option is A139.5ohm−1cm2eq−1
Kohlrausch law:
"At infinite dilution, when dissociation is complete, each ion makes a definite contribution towards equivalent conductance of the electrolyte irrespective of the nature of the ion with which it Is associated and the value of equivalent conductance at infinite dilution for any electrolyte is the sum of the contribution of its constituent ions", i.e., anions and cations.