CUET · CHEMISTRY · PYQ PAPER 2023

Select the correct statement.

A For the zero order reaction, the half-life of a reaction is directly proportional to the initial concentration of the reactant, whereas for the first order reaction, the half-life is independent of the initial concentration of the reacting species.
B For the zero order reaction, the half-life of a reaction is inversely proportional to the initial concentration of the reactant, whereas for the first order reaction, the half-life is independent of the initial concentration of the reacting species.
C The half-life of a reaction is directly proportional to the initial concentration of the reacting species for both zero and first order reactions.
D The half-life of a reaction is inversely proportional to the initial concentration of the reacting species for both zero and first order reactions.

Verified Solution

Answer & Solution

Correct Answer

(A) For the zero order reaction, the half-life of a reaction is directly proportional to the initial concentration of the reactant, whereas for the first order reaction, the half-life is independent of the initial concentration of the reacting species.

Step-by-step Solution

Detailed explanation

For the zero order reaction, the half-life of a reaction is directly proportional to the initial concentration of the reactant, whereas for the first order reaction, the half-life is independent of the initial concentration of the reacting species.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Explore more questions on app

From CUET

Explore more questions on app