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Which of the following cannot be used as secondary reference electrode?

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Which of the following cannot be used as secondary reference electrode?

(a) Calomel electrode

(b) Silver-silver chloride electrode

(c) Mercury-mercury sulphate electrode

(d) Glass electrode

This question was posed to me in an online interview.

My query is from Secondary Reference Electrodes in division pH Meters and Ion Analysers of Analytical Instrumentation

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Correct option is (d) Glass electrode

Easy explanation: Glass electrode cannot be used as secondary reference electrode. It is an indicator electrode. It responds to the changes in the activity of the analyte ion.

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