JEE Advanced 2015 · Paper 2 · Chemistry Q35

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ChemistryMultiple correct+4 / -2Question 35 of 60

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

\ce{O2}

is physisorbed

heat is released

occupancy of

\pi^*_{2p}

\ce{O2}

is increased

bond length of

\ce{O2}

is increased

Answer and worked solution

Official answer: B, C, D

Electron transfer from the metal to O₂ forms a chemical bond, so this is chemisorption, not physisorption. (A) is false.

(B) Chemisorption is exothermic: heat is released. True.
(C) The transferred electrons enter the $\pi^*_{2p}$ orbitals. True.
(D) Extra antibonding electrons lower the bond order and lengthen the O-O bond. True.

(B), (C), (D)

Topics:Adsorption Molecular orbital theory

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JEE Advanced 2015 · Paper 2, Chemistry question 35