The correct answer is (a) induced emf
Explanation: The potential (E) of the glass electrode may be written by means of the Nernst
equation:
where, Eo = standard potential R = gas constant T = absolute temperature F = Faraday constant DpH = pH value deviation from 7. The above relation shows that the emf developed in the electro-chemical pH cell is a linear function of DpH.
