When O 2 is adsorbed on a metallic surface, electron transfer occurs from the metal to O 2 . The TRUE…

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)
  1. O2 is physisorbed
  2. Heat is released
  3. Occupancy of π2p* of O2 is increased
  4. Bond length of O2 is increased

Solution

It is a chemisorption ΔH is -ve for adsorption. Due to electron intake in O2 molecule π2px* or π2py* (ABMO) will gain electrons and bond order of O2 molecule (Adsorbed) will decrease and bond length increased.

Asked in: JEE Advanced 2015 (Paper 2)

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