The equivalent conductance of NaCl at concentration C and at infinite dilution are ${\mathrm{\lambda }}_{\mathrm{C}}\text{ and }{\mathrm{\lambda }}_{\mathrm{\infty }}$ respectively The correct relationship between ${\mathrm{\lambda }}_{\mathrm{C}}\text{ and }{\mathrm{\lambda }}_{\mathrm{\infty }}$ is given as (where, the constant B is positive)

According to Debye Huckel Onsager equation,
           ${\mathrm{\lambda }}_{\mathrm{C}}={\mathrm{\lambda }}_{\mathrm{\infty }}-\mathrm{B}\sqrt{\mathrm{C}}$
where, ${\mathrm{\lambda }}_{\mathrm{C}}$ = limiting equivalent conductivity at concentration C
          ${\mathrm{\lambda }}_{\infty }$  = limiting equivalent conductivity at infinite dilution
              C = concentration