JEE Advanced · Chemistry · 19. Surface Chemistry

When $O_{2}$ is adsorbed on a metallic surface, electron transfer occurs from the metal to $O_{2}$ . The TRUE statement(s) regarding this adsorption is(are)

A $O_{2}$ is physisorbed
B Heat is released
C Occupancy of $π_{2 p}^{*}$ of $O_{2}$ is increased
D Bond length of $O_{2}$ is increased

Verified Solution

Answer & Solution

Correct Answer

(B) Heat is released

Step-by-step Solution

Detailed explanation

It is a chemisorption

Δ H

- v e

for adsorption. Due to electron intake in

O_{2}

molecule

π_{2 p x}^{*}

π_{2 p y}^{*}

(ABMO) will gain electrons and bond order of

O_{2}

molecule (Adsorbed) will decrease and bond length increased.

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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When O2 is adsorbed on a metallic surface, electron transfer occurs from the metal to O2 . The TRUE statement(s) regarding this adsorption is(are)

Step-by-step Solution

When $O_{2}$ is adsorbed on a metallic surface, electron transfer occurs from the metal to $O_{2}$ . The TRUE statement(s) regarding this adsorption is(are)