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In dissolved oxygen analyser, the electrometer consists of which of the following solutions?

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In dissolved oxygen analyser, the electrometer consists of which of the following solutions?

(a) Calcium hydroxide solution

(b) Magnesium hydroxide solution

(c) Potassium hydroxide solution

(d) Calcium oxide solution

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Asked question is from Dissolved Oxygen Analyser topic in portion Dissolved Component Analysers of Analytical Instrumentation

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Correct answer is (c) Potassium hydroxide solution

For explanation I would say: In dissolved oxygen analyser, the electrometer consists of potassium hydroxide solution. It produces hydrogen due to the electrolysis process.

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