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4.Chemical Bonding and Molecular Structure
normal
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)
$(A)$ $O _2$ is physisorbed
$(B)$ heat is released
$(C)$ occupancy of $\pi_{2 p }^*$ of $O _2$ is increased
$(D)$ bond length of $O _2$ is increased
A
$(B,C,D)$
B
$(A,B,C)$
C
$(A,B,D)$
D
$(A,C,D)$
(IIT-2015)
Solution
* Adsorption of $O _2$ on metal surface is exothermic.
* During electron transfer from metal to $O _2$ electron occupies $\pi_{2 p }$ orbital of $O _2$.
* Due to electron transfer to $O _2$ the bond order of $O _2$ decreases hence bond length increases.
Standard 11
Chemistry
