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Which of the following reference electrode is placed in the solution of carbon dioxide electrode?

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Which of the following reference electrode is placed in the solution of carbon dioxide 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 quiz.

My doubt is from Special Designs of Ion Selective Electrodes topic in portion pH Meters and Ion Analysers of Analytical Instrumentation

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The correct answer is (b) Silver/silver chloride electrode

The explanation: A silver/silver chloride reference electrode is placed in the solution. A glass electrode is also placed in the solution but it is not a reference electrode.

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