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When O2 is adsorbed on ametallic surface...

When `O_2` is adsorbed on ametallic surface, electron transfer occurs from 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

both length of `O_(2)` is increased

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The correct Answer is:
B, C, D
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