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To monitor oxides of nitrogen in stack effluents, the sample containing oxides of nitrogen is passed through a flask containing solution of H2O2 in sulphuric acid. Nitric acid is formed. The nitrate ions then react with phenol-disulphonic acid to produce blue colour.

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To monitor oxides of nitrogen in stack effluents, the sample containing oxides of nitrogen is passed through a flask containing solution of H2O2 in sulphuric acid. Nitric acid is formed. The nitrate ions then react with phenol-disulphonic acid to produce blue colour.

(a) True

(b) False

The question was posed to me in an international level competition.

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

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Correct choice is (b) False

To elaborate: The nitrate ions react with phenol-disulphonic acid to produce yellow colour. This is measured colorimetrically.

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