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Which of the following reference electrode is used in anodic protection?

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Which of the following reference electrode is used in anodic protection?

(a) Standard hydrogen electrode

(b) Copper/copper sulfate reference electrode

(c) Standard hydrogen electrode and calomel electrode

(d) Calomel electrode

This question was addressed to me at a job interview.

My question comes from Cathodic and Anodic Protection in portion Corrosion Prevention of Corrosion Engineering

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Right choice is (d) Calomel electrode

For explanation: The Calomel electrode is used to measure the potential maintained during the operation. It is connected to the third terminal of potentiostat whereas metal and auxiliary cathode are connected to first and second terminals respectively.

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