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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

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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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