Surface Chemistry - Result Question 28

####29. 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)

(2015 Adv.)

(a) O2 is physisorbed

(b) heat is released

(c) occupancy of π2p of O2 is increased

(d) bond length of O2 is increased

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Answer:

Correct Answer: 29. (c)

Solution:

  1. Since, adsorption involves electron transfer from metal to O2, it is chemical adsorption not physical adsorption, hence (a) is incorrect. Adsorption is spontaneous which involves some bonding between adsorbent and adsorbate, hence exothermic. The last occupied molecular orbital in O2 is $\pi^{} 2 p.Hence,electrontransferfrommetaltooxygenwillincreaseoccupancyof\pi^{} 2 pmolecularorbitals.Alsoincreaseinoccupancyof\pi^{*} 2 porbitalswilldecreasebondorderandhenceincreasebondlengthofO _2$.


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