Question

The reaction between $H_2\left(g\right)$ and $O_2\left(g\right)$ is highly feasible yet allowing the gases to stand at room temperature in the same vessel does not lead to the formation of water. Explain.

Answer 1

This reaction does not take place at the room because the activation energy of the reaction is very high.

It means the activation energy of the reaction is very high at room temperature but at high-temperature, H-H and O-O bond break and colliding particles cross the energy barrier. This is why reaction between $H_2\left(g\right)$ and $O_2\left(g\right)$ does not lead to the formation of water at room temperature while keeping in the same vessel.