Question: 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

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)

(A) O2 is physisorbed

(B) Heat is released

(C)Occupancy of ?2p of O2 is increased

(D) Bond length of O2 is increased

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