# In castner-kellner cell used for the manufacture of NaOH,the cathode in the central compartment is made up of

$(a)\;Gold\qquad(b)\;Silver\qquad(c)\;Iron\qquad(d)\;Mercury$

In castner-kellner cell used for the manufacture of NaOH,the cathode in the central compartment is made up of iron.
Hence (c) is the correct answer.