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An increase in equivalent conductance of...

An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to:

A

increase in number of ions

B

increase in ionic mobility of ions

C

`100%` ionisation of electrolyte at normal dilution

D

increase in both number of ions and ionic mobility of ions

Text Solution

Verified by Experts

The correct Answer is:
B
By definition, a strong electrolyte ionizes or dissociates almost completely. At high concentration, the average distance between ions is very small. Consequently,they may re combine to form ion-pairs, which have no contribution to conductance. With dilution, the average distance between ions increases. This leads to decrease in tendency to form ion pairs. In other words, the ionic mobility increases as more and more ions arc able to participate.
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