Consider the following two-step reaction mechanism: A (g) + B (g) → X (g) + Y (g), X (g) + C (g) → Y (g) + Z (g). Which of the following statements about this mechanism is or are true?

A. Both of the steps in this mechanism are bimolecular.

B. The overall reaction is A (g) + B (g) + C (g) → Y (g) + Z (g).

C. The substance X (g) is an intermediate in this mechanism.

Option, A and C

Explanation:

The two steps reaction is as follows:

A (g) + B (g) → X (g) + Y (g) first step

X (g) + C (g) → Y (g) + Z (g) second step

In both the mechanism, two molecules are involved as the reactants, therefore, it both the steps are bimolecular.

Substance 'X' formed in first step and consumed in the second step. So, it a an intermediate species.

For overall reaction, add both the steps:

A (g) + B (g) + C (g) → 2Y (g) + Z (g)

Therefore, the correct options are option A and C