Question

At high temperature, there’s presence of only oxygen and nitrogen molecules in the air.

(a) True

(b) False

The question was asked during an internship interview.

Question is from High Temperature Gases topic in chapter Properties of High Temperature Gases of Aerodynamics

Answer 1

Correct option is (b) False

To explain: While analyzing the chemical composition of air at normal temperature and pressure, the major composition is of oxygen and nitrogen molecules. Presence of water vapor, argon, helium etc. are very less thus they can be neglected. Although, at higher temperature (2500K – 9000K), oxygen and nitrogen undergo chemical reaction and there is presence of O, N, NO, NO^+ etc.