1.

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

Answer»

`O_(2)` is physisorbed
heat is released
occupany of `pi ***wp` of `O_(2)` is increased
bond length of `O_(2)` is increased.

Solution :As ELECTRON transfer occurs from the metal to `O_(2)` it is chemisorption.
Adsorption is an exothermic process i.e. heat is released. The electronic configuration of `O_(2)` MOLECULE is
`KK sigma 2s^(2), sigma***2s^(2), sigma2p_(z)^(2),(pi2p_(x)^(2)=pi2p_(y)^(2)),(pi***2p_(x)^(1)=pi***2p_(y)^(1))`
When electron transfer occurs, it occupies `pi**2p_(x)` orbital, so bond order decreases from 2.0 to 1.5 hence, the bond length increases.


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