TS EAMCET · Chemistry · Surface Chemistry

Assertion (A) van der Waals' forces are reponsible for chemisorptions.Reason (R) High temperature is favourable for chemisorptions. The correct answer is

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

Verified Solution

Answer & Solution

Correct Answer

(A) (A) is false, but (R) is true

Step-by-step Solution

Detailed explanation

van der Waals' forces are not responsible for chemisorptions. These forces are involved in physisorption. For chemisorptions, high temperature is favourable. It increases with increase of temperature.

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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