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When O(2) is adsorbed on a metallic surf...

When `O_(2)` is adsorbed on a metallic surface, electron transfer occurs form the metal to `O_(2).` The true statement (s) regarding this adsorption is (are)

A

`O_2` is physisorbed

B

heat is released

C

occupancy of `pi_(2p) " of "O_2` is increased

D

bond length of `O_2` is increased.

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