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Which of the following methods are not used for the measurement of sulphur dioxide?

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Which of the following methods are not used for the measurement of sulphur dioxide?

(a) Colorimetric method

(b) Correlation spectroscopy

(c) Paramagnetic analyzers

(d) Flame-photometry

I had been asked this question by my school teacher while I was bunking the class.

This interesting question is from Sulphur Di-oxide Monitoring topic in chapter Pollution Monitoring Instruments of Analytical Instrumentation

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Right choice is (c) Paramagnetic analyzers

Explanation: Sulphur di-oxide cannot be analysed using paramagnetic analyzer. This is because sulphur dioxide does not have paramagnetic property.

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