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NO can be analysed by converting it into NO2 and passing it through potassium permanganate. Which of the following is the main disadvantage of this method?

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NO can be analysed by converting it into NO2 and passing it through potassium permanganate. Which of the following is the main disadvantage of this method?

(a) Less accuracy

(b) Dye formed is unstable

(c) Dye formed is colourless

(d) Quantity of dye is low

I had been asked this question in a national level competition.

This key question is from Estimation of Nitrogen Oxides in chapter Pollution Monitoring Instruments of Analytical Instrumentation

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The correct option is (b) Dye formed is unstable

To explain: NO can be analysed by converting it into NO2 and passing it through potassium permanganate. The main disadvantage of this method is that the dye formed is unstable. Hence, it is not suitable for a collection of 24 hours sample.

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