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The ability of sulphur dioxide to reduce iodine is used in which of the following methods?

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The ability of sulphur dioxide to reduce iodine is used in which of the following methods?

(a) Colorimetry

(b) Conductivitimetry

(c) Coulometry

(d) Gas chromatography

I had been asked this question in my homework.

My question is based upon Sulphur Di-oxide Monitoring topic in chapter Pollution Monitoring Instruments of Analytical Instrumentation

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The correct option is (c) Coulometry

The explanation: The ability of sulphur dioxide to reduce iodine is used in Coulometry method to measure sulphur dioxide. The mass of I2 reacted per unit time will indicate the amount of sulphur dioxide.

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