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Which of the following calomel electrodes are used for accurate work?

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Which of the following calomel electrodes are used for accurate work?

(a) Saturated calomel electrode

(b) Electrode with 0.1M Kcl

(c) Electrode with 1M Kcl

(d) Electrode with 2M Kcl

I got this question in examination.

Enquiry is from Secondary Reference Electrodes topic in section pH Meters and Ion Analysers of Analytical Instrumentation

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The correct option is (b) Electrode with 0.1M Kcl

Explanation: Calomel electrode with 0.1M Kcl is used for accurate work. Saturated calomel electrodes are easy to prepare and maintain.

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