Answer:
Conductivity is the conductance
of the solution of an electrolyte enclosed in a cell with two electrodes of
unit area of cross-section separated by one cm or it is the conductance of one centimetre
cube of the solution of an electrolyte.
Units. Ohm?1 cm-1
or 
?1
cm?1 or S cm?1
Molar conductivity. It is defined
as the conductance of all the ions produced by one gram mole of the electrolyte
in solution and is denoted by 
.
Here C is the molar concentration
of the solution.
Units. Ohm?1 cm2
mol?1 or S cm2 mol?1.
Variation with concentration Conductivity
of a solution of an electrolyte decreases with decrease in concentration. This
is because conductivity depends upon number of ions per unit volume of the
solution and with decrease in concentration, no. of ions per unit volume
becomes lesser. Molar conductivity of a solution of an electrolyte increases
with dilution. This is because with decrease in concentration, no. of ions as
well as their mobility increase.
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