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The calomel electrodes are classified based on which of the following?

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The calomel electrodes are classified based on which of the following?

(a) Materials used in the electrode

(b) Amount of mercury present

(c) Concentration of Kcl

(d) Purity of mercury

I had been asked this question in a national level competition.

This interesting question is from Secondary Reference Electrodes topic in division pH Meters and Ion Analysers of Analytical Instrumentation

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The correct option is (c) Concentration of Kcl

To elaborate: Several convenient calomel electrodes are available. They are classified based on the concentration of Kcl.

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