TS EAMCET · Chemistry · Surface Chemistry

The following graph is obtained for physisorption of a gas as a function of pressure at different temperatures.

The correct order of the temperatures is:

A $T_{3} < T_{2} < T_{1}$
B $T_{2} < T_{3} < T_{1}$
C $T_{2} < T_{1} < T_{3}$
D $T_{1} < T_{3} < T_{2}$

Verified Solution

Answer & Solution

Correct Answer

(B) $T_{2} < T_{3} < T_{1}$

Step-by-step Solution

Detailed explanation

Physical adsorption or physisorption decreases with increase of temperature. According to Freundlich absorption isotherm: $\frac{x}{m}=k \cdot p^{1 / n} \quad(n>1)$ Observing the graph, we get the order of the temperatures as: $T _2< T _3< T _1$

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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The following graph is obtained for physisorption of a gas as a function of pressure at different temperatures.The correct order of the temperatures is:

Step-by-step Solution

The following graph is obtained for physisorption of a gas as a function of pressure at different temperatures.

The correct order of the temperatures is: