In Castner - Kellner cell for the manufacture of NaOH( caustic soda ), – InterviewSolution

1.	In Castner - Kellner cell for the manufacture of NaOH( caustic soda ), Hg acts as cathode as well as anode.
Answer» Solution :This cell is also CALLED mercurry cathode cell. In this cell, `Hg` flows along the bottom of the cell and acts as cathode in the left HAND compartment fitted with graphite anodes in brine `(NACL)` solution, whereas the right hand compartment is fitted with `Fe` CATHODES dippped in very dilute `NAOH` solution and `Hg` acts as anode in this compartment.Thus `Hg` acts as an intermediate electrode by induction, cathode on `LHS` and anode in `RHS.`

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