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Which of the following reference electrodes are used as internal and external reference electrodes in combination electrodes?

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Which of the following reference electrodes are used as internal and external reference electrodes in combination electrodes?

(a) Silver/silver chloride electrode

(b) Calomel electrode

(c) Mercury/mercury sulphate electrode

(d) Mercury/mercury chloride electrode

I had been asked this question in class test.

This interesting question is from Combination Electrode topic in portion pH Meters and Ion Analysers of Analytical Instrumentation

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The correct choice is (a) Silver/silver chloride electrode

To explain: Silver/silver chloride electrode is used as internal and external reference electrodes in combination electrodes. Internal reference electrode is identical with an external reference electrode.

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