Question

The second most abundant constituent of air is:

• A. Oxygen
• B. Nitrogen
• C. Water vapour
• D. Carbon dioxide

Answer 1

The correct option is C

Water vapour

The most abundant constituents of air is Oxygen. The constituents of air are:

$$\begin{array}{ccc}\text{Pure Gas Name}& \text{Symbol}& \text{Mole Fraction}\\ \text{Nitrogen}& N_2& 0.78084\\ \text{Oxygen}& O_2& 0.209476\\ \text{Argon}& Ar& 0.00934\\ \text{Carbon dioxide}& C{O}_2& 0.000314\end{array}$$