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Internal Reference electrode is of _______

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Internal Reference electrode is of _______

(a) gold

(b) silver

(c) platinum

(d) graphite

The question was posed to me in an international level competition.

The doubt is from Spirometry topic in portion Pulmonary Function Analysers of Biomedical Instrumentation

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The correct choice is (b) silver

To explain I would say: The internal reference electrode is silver/silver chloride and the calomel reference electrode is connected to a small pool of saturated KCI, through a porous pin. Accuracy of 0.001 pH can be obtained with this electrode against a constant buffer.

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