Ncert Exercises & Solutions

Select the correct option based on statements below:

Assertion (A):	The rate constant determined from the Arrhenius equation is fairly accurate for simple as well as complex molecules.
Reason (R):	Reactant molecules undergo chemical change irrespective of their orientation during a collision.

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	Both (A) and (R) are false.

HINT: The proper orientation of reactant molecules lead to bond formation.

Explanation:

Rate constant determined from the Arrhenius equation is fairly accurate for simple and complex molecules because only

those molecules which have proper orientation during a collision (ie., effective collision) and sufficient kinetic energy lead the

chemical change. Hence, the assertion is correct, but the reason is incorrect.