Which of the following are Reference electrodes?(a) Standard hydrogen electrode(b) Calomel electrode(c) Silver electrode(d) Standard hydrogen electrode and a calomel electrodeThe question was asked during an interview for a job.My query is from Principles in section Corrosion Principles of Corrosion Engineering

Which of the following are Reference electrodes?(a) Standard hydrogen

1.	Which of the following are Reference electrodes?(a) Standard hydrogen electrode(b) Calomel electrode(c) Silver electrode(d) Standard hydrogen electrode and a calomel electrodeThe question was asked during an interview for a job.My query is from Principles in section Corrosion Principles of Corrosion Engineering
Answer» Correct choice is (d) Standard hydrogen electrode and a CALOMEL electrode The best I can explain: In EMF series all metals are referenced against the hydrogen electrode (H2/H+) which is arbitrarily DEFINED as zero. This is known as the Standard hydrogen electrode (SHE). The SATURATED calomel electrode also acts as a reference electrode based on the reaction between elemental mercury (Hg) and mercury(I) chloride (Hg2Cl2). And the electrode POTENTIAL value of the calomel electrode is +0.241 V.

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