Thank you for reporting, we will resolve it shortly
Q.
In Castner-Kellner cell, used for the manufacture of NaOH, the cathode in the central compartment is made of
NTA AbhyasNTA Abhyas 2022
Solution:
In central compartment, iron is used as cathode and the layer of Hg acts as anode by induction.
In the outer compartments, graphite rods are used as anode and the mercury layer acts as cathode by induction.
Cathode $\text{Na}^{\text{+}} \, \text{+} \, \text{e}^{-} \overset{\text{Hg}}{ \rightarrow } \text{Na-Hg }$ (sodium amalgam)
Anode $2Cl^{-} \rightarrow Cl_{2}\left(\right.g\left.\right)+2e^{-}$