Question

Even though air contains $78\%$ nitrogen, $20\%$ oxygen by volume and formation of $NO$ is thermodynamically feasible, they do not combine to form $NO$. This is because

• A. Both $O_2$ and $N_2$ are diatomic gases
• B. The partial pressure of oxygen in the atmosphere is very low
• C. The formation of $NO$ requires high temperature
• D. At atmospheric pressure $NO$ formed spontaneously decompose to the elements

Answer 1

The correct option is C

The formation of $NO$ requires high temperature

$N_2$ combines with $O_2$ only at high temperature, this happens naturally during lightning