Question

Which of the following reaction is not involved in combustion calculations?

(a) CH4 + 2O2   →  CO2 + 2H2O

(b) 2C + O2   →    2CO

(c) N2 + O2   → 2NO

(d) 2H2 + O2  →     2H2O

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

This intriguing question originated from Combustion Calculation in chapter Fuels and Combustion of Engineering Chemistry II

Answer 1

Correct answer is (c) N2 + O2   → 2NO

The explanation is: Combustion means conversion of a reactant in the form of CO2 and H2O. The CO obtained in 2C + O2   →    2CO option is again oxidized to form CO2. The calculation of combustion in done by taking number of moles in consideration.