TS EAMCET · Chemistry · Surface Chemistry

Assertion (A) : A catalyst increases the rate of a reaction. Reason (R) : In presence of a catalyst, the activation energy of the reaction increases. The correct answer is

A Both (A) and (R) are true and (R) is the correct explanation of (A)
B Both \((A)\) and \((R)\) are true but \((R)\) is not the correct explanation of \((\mathrm{A})\)
C (A) is true, but (R) is not true
D (A) is not true, but (R) is true

Verified Solution

Answer & Solution

Correct Answer

(C) (A) is true, but (R) is not true

Step-by-step Solution

Detailed explanation

A catalyst increases the rate of reaction because in the presence of catalyst the activation energy of the reaction decreases.

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.

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