Question

Rate of a general reaction $A+B$ $\rightarrow$ products can be expressed as follows on the basis of collision theory. Rate=$Z_{AB^{e^{-E_a /RT}}}$ Which of the following statements is not correct for the above expression?

• A. $Z$ is collision frequency and is equal to number of collisions per second per unit volume of the reaction mixture.
• B. $e^{-E_{a} /RT}$ is the fraction of molecules with kinetic energy equal to or greater than $E_{a}.$
• C. $E_{a}$ is activation energy of the reaction.
• D. All the molecules which collide with one other are effective collisions.

Answer 1

Answer: (D)

Only those collisions in which molecules collide with sufficient energy, called threshold energy and proper orientation are effective collisions. Rest of the molecules collide and bounce back.