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In combination electrode, which of the following electrodes are built together?

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In combination electrode, which of the following electrodes are built together?

(a) Primary electrode, secondary reference electrode

(b) Primary reference electrode, glass electrode

(c) Glass electrode, secondary reference electrode

(d) Glass electrode with another glass electrode

The question was asked during an online interview.

My query is from Combination Electrode topic in portion pH Meters and Ion Analysers of Analytical Instrumentation

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Right option is (c) Glass electrode, secondary reference electrode

To elaborate: In combination electrode, glass electrode and secondary reference electrode are built together. Internal reference electrode is identical with an external reference electrode.

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