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How is NO converted to NO2 for analysis in Chemiluminescent analyser?

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How is NO converted to NO2 for analysis in Chemiluminescent analyser?

(a) Treating sample gas with pressurized oxygen

(b) Treating sample gas with ozone

(c) Treating sample gas with oxygen at low pressure

(d) Treating sample gas with water at high pressure

I got this question in an international level competition.

My enquiry is from NO2 Analyser topic in chapter Industrial Gas Analysers of Analytical Instrumentation

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Right answer is (b) Treating sample gas with ozone

Easy explanation: NO is converted to NO2 for analysis in Chemiluminescent analyser by treating sample gas with ozone.

NO + O3 —>NO2 + O2

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