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Question

For a strong electrolyte, equivalent conductance increases slowly with dilution and can be expressed by the relationship : $$\Lambda_{m}\, =\, \Lambda^{\circ}_{m}\, -\, A\sqrt{c}$$.  Which electrolyte(s) have same value of A ?


A
NaCl
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B
CaCl2
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C
ZnCl2
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D
MgSO4
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Solution

The correct options are
A $$CaCl_{2}$$
C $$ZnCl_{2}$$
Effect of Concentration on Equivalent Conductance:
The variation of equivalent conductance  or molar conductance with the concentration of the electrolyte is generally expressed graphically, as follows: It is a straight line with negative slope.

$$\Lambda_{m}\, =\, \Lambda^{\circ}_{m}\, -\, A\sqrt{c}$$

A depends on the type (magnitude of charge on cation and anion) of electrolyte for a given temperature of solvent.

Chemistry

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