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Nitrogen oxide cannot be directly analysed using UV and Visible analyzers due to which of the following reasons?

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Nitrogen oxide cannot be directly analysed using UV and Visible analyzers due to which of the following reasons?

(a) Less accuracy

(b) Very low range

(c) It leads to contamination of the sample

(d) It is transparent in UV visible regions

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

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Correct answer is (d) It is transparent in UV visible regions

For explanation I would say: Nitrogen oxide cannot be directly analysed using UV and Visible analyzers because it is transparent in UV visible regions. Hence, it is converted into nitrogen dioxide and then analysed.

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