21. the effective resistance of a l em electrode electrolyte interface of hg. hh at 25°c for an overpotential less than 10 mv is: [given: the exchange current d

21. The effective resistance of a l em electrode electrolyte interface of Hg. HH at 25°C for an overpotential less than 10 mV is: [given: the exchange current density = 0.79 x 10* A cm] (a) 6.8 x 10 ohm (b) 3.3 x 10 ohm (c)1.7x 10 ohm (d) 60 ohm