1.

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 is (are)

Answer»

`O_(2)` is physisorbed
heat is released
occupancey of `pi_(2p)^(**)` of `O_(2)` increased
bond length of `O_(2)` is increased

Solution :When electron transfer occurs from metal to `O_(2),` chemical bond is formed. Hence,It is chemisorption and not physisorption, Hence (a) is not ture. As it chemisorption, heat is released. Hence, (b) is TRUE. When `O_(2)` takes up ONE electron, it becomes `O_(2)^(-).` According to MOLECULAR orbital theory, new electron will enter into `pi_(2PI)^(**).` As a result, bond order decreases. Hence, bond length increases. Hence, (c ) and (d) true.


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