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In the conductometric method, the difference in gas conductivity before and after passing sample gas denotes which of the following?

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In the conductometric method, the difference in gas conductivity before and after passing sample gas denotes which of the following?

(a) Efficiency of the cell

(b) Quantity of reagent

(c) Concentration of gas

(d) Density of the reagent

This question was addressed to me in semester exam.

My question is taken from Electrochemical Methods for Oxygen Analysis topic in section Industrial Gas Analysers of Analytical Instrumentation

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The correct option is (c) Concentration of gas

The explanation is: In the conductometric method, the difference in gas conductivity before and after passing sample gas denotes the concentration of gas. The sample gas is passed through the liquid reagent.

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