Question

In which of the following ways can chemiluminescence occur in compounds of nitrogen?

(a) When NO2 returns to ground state from excited state

(b) When NO reacts with oxygen

(c) When NO reacts with ozone

(d) When NO2 is reduced to NO

This question was posed to me by my college director while I was bunking the class.

This key question is from Estimation of Nitrogen Oxides topic in chapter Pollution Monitoring Instruments of Analytical Instrumentation

Answer 1

The correct option is (a) When NO2 returns to ground state from excited state

Explanation: When NO2 returns to ground state from excited state, chemiluminescence occurs. NO2 in excited state returns to ground state with the emission of radiant energy.