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The gel used in combination electrodes does not have which of the following characteristic?

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The gel used in combination electrodes does not have which of the following characteristic?

(a) Non-toxic

(b) USP grade

(c) Inorganic material

(d) Polyacrylamide

The question was posed to me in unit test.

My question is from Combination Electrode in division pH Meters and Ion Analysers of Analytical Instrumentation

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Best answer
The correct option is (c) Inorganic material

Explanation: The gel used in combination electrodes is organic. It can also be made of polyacrylamide.

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