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Which of the following materials are used as electrodes in the coulometric method for the measurement of sulphur dioxide?

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Which of the following materials are used as electrodes in the coulometric method for the measurement of sulphur dioxide?

(a) Gold

(b) Silver

(c) Platinum

(d) Nickel

The question was posed to me in homework.

The query is from Sulphur Di-oxide Monitoring topic in section Pollution Monitoring Instruments of Analytical Instrumentation

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Best answer
Right answer is (c) Platinum

To explain: In Coulometric arrangement, the electrodes are made of platinum. These act as the anode and the cathode.

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