At `25^(@)C`, a conductivity cell was filled with `0.1 M NalL` solution. The conductivity of this solution is `9.2 xx 10^(3) s cm^(-1)` and resistance is `176.6 ohm`. The cross-sectional is `176.6 ohm`. What must have been the distance between the electrodes ?

Options

A. `4.5 cm`
B. `6.5 cm`
C. `9.8 cm`
D. `5.9 cm`

Answer

B

Explanation

`kappa = (1)/(R) xx (1)/(a)`
or `l = kappa xx R xx a`
`= 9.2 xx 10^(-3) xx 176.6 xx 4 = 6.49 cm`