Verified Solution • 2025–26 Session moderate

QJEEAdv15Ch8de9: JEE Advanced 2015 Chemistry - Class 12 JEEAdv15Ch8de9 Solution: When O 2 is adsorbed on a metallic surface, electron transfer…

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)

Multiple Choice Options

  • A O2 is physisorbed
  • B Heat is released
  • C Occupancy of π2p∗\pi _{2p}^* of O2 is increased
  • D Bond length of O2 is increased

Step-by-Step Verified Solution

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 π\pi *2p. Hence, electron transfer from metal to oxygen will increase occupancy of π\pi *2p molecular orbitals. Also increase in occupancy of π\pi *2p orbitals will decrease bond order and hence increase bond length of O2.

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