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In Jacob-Hochheiser method, NO2 is passed through a dilute solution of sodium hydroxide forming the nitrite ion. The nitrite ion is reacted with sulphanilamide and ethylene diamine in which of the following to form the highly coloured azo dye?

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In Jacob-Hochheiser method, NO2 is passed through a dilute solution of sodium hydroxide forming the nitrite ion. The nitrite ion is reacted with sulphanilamide and ethylene diamine in which of the following to form the highly coloured azo dye?

(a) Sulphuric acid

(b) Hydrochloric acid

(c) Nitric acid

(d) Phosphoric acid

The question was asked by my school teacher while I was bunking the class.

The query is from Estimation of Nitrogen Oxides topic in portion Pollution Monitoring Instruments of Analytical Instrumentation

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Right choice is (d) Phosphoric acid

For explanation: In Jacob-Hochheiser method, NO2 is passed through a dilute solution of sodium hydroxide to form the nitrite ion. The nitrite ion is treated with sulphanilamide and ethylene diamine in phosphoric acid to form the highly coloured azo dye. Then, colorimetric analysis is done.

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