For a bimolecular elementary reaction between A and B, the rate of reaction is expressed as

$rate=P.Z_{AB}e^{(-\frac{E_a}{RT})}$

Identify the terms $P, Z_{AB}$ and $E_a$, involved in this expression, respectively

Probability factor, collision frequency, Activation energy

The correct answer is Option (3) → Probability factor, collision frequency, Activation energy

For a bimolecular elementary reaction according to collision theory:

$\text{rate} = P \cdot Z_{AB} \cdot e^{-E_a/RT}$

Where:

• P = probability (steric) factor
• $Z_{AB}$ = collision frequency between A and B
• E_a = activation energy