NEET 2010 Chemistry question

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

(1)increase in ionic mobility of ions.Correct
(2)100% ionisation of electrolyte at normal dilution.
(3)increase in both i.e. number of ions and ionic mobility of ions.
(4)increase in number of ions.

Answer: (1)

Solution

A strong electrolyte is already completely ionised at all concentrations, so the number of ions per unit of electrolyte cannot increase on dilution; this rules out (3) and (4). Statement (2) is a true fact but is not the reason for the increase. On dilution the ions are

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Question ID VK-090528