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Which of the following occurs in Electrochemical cells used for the detection of hydrogen sulphide?

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Which of the following occurs in Electrochemical cells used for the detection of hydrogen sulphide?

(a) Change in resistance

(b) Redox reaction

(c) Oxidation-reduction reaction

(d) Change in colour

I have been asked this question during an interview.

Query is from H2S Analysers topic in portion Industrial Gas Analysers of Analytical Instrumentation

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Right answer is (c) Oxidation-reduction reaction

The explanation: In Electrochemical cells, an oxidation-reduction reaction occurs in the presence of hydrogen sulphide. A current starts flowing and it is proportional to the concentration of hydrogen sulphide.

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