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A pink coloured dye complex is formed when air containing NO2 is passed in an absorbing solution consisting of __________ and diamine dissolved in the acetic acid medium.

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A pink coloured dye complex is formed when air containing NO2 is passed in an absorbing solution consisting of __________ and diamine dissolved in the acetic acid medium.

(a) Sulphuric acid

(b) Sulphonyl

(c) Sulphonic acid

(d) Sulphanilic acid

I have been asked this question in an online quiz.

My doubt stems from NO2 Analyser in portion Industrial Gas Analysers of Analytical Instrumentation

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Right option is (d) Sulphanilic acid

Easiest explanation: A pink coloured dye complex is formed when air containing NO2 is passed in an absorbing solution consisting of sulphanilic acid and diamine dissolved in the acetic acid medium. This is called Saltzman method.

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