1.

A weak electrolyte having the limiting equivalent conductance of 400 S cm^(2)g. "equivalent"^(-1) at 298 K is 2% ionized in its 0.1N solution. The resistance of this solution (in ohms) in an electrolytic cell of cell constant 0.4 cm^(-1) at this temperature is:-

Answer»

200
300
400
500

Solution :`alpha=(wedge_(m))/_(wedge_(oo))`
`wedge_(oo)=400S" "cm^(2)g" "EQ^(-1)`
`wedge_(m)=wedge_(oo)xxalpha=400xx(2)/(100)=8`
`wedge_(m)=(kxx1000)/(C)`
`k=(1)/(R)xx`cell CONSTANT
`wedge_(m)=(1)/(R)xx`cell constant`xx(1000)/(C)`
`R=("cell constant")/(wedge_(m)xxC)xx1000`
`R=(0.4xx1000)/(8xx0.1)=500ohm`


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