MEDIUM
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In a homonuclear molecule which of the following set of orbitals is degenerate?

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Important Questions on Chemical Bonding and Molecular Structure

EASY
Stability of the species  Li 2 , Li 2 - and Li 2 +  increases in the order of
MEDIUM
In which of the following pairs of molecules/ions, both the species are not likely to exist?
HARD

Decreasing order of stability of O2, O2-, O2+ and O22- is:

HARD
In which of the following processes, the bond order has increased and paramagnetic character has changed to diamagnetic?
MEDIUM
Which one of the following properties is not shown by NO ?
EASY
Which one of the following molecules is expected to exhibit paramagnetic behaviour?
MEDIUM
According to molecular orbital theory, which of the following molecule will not be available?
EASY
After understanding the assertion and reason, choose the correct option.

Assertion: In the bonding molecular orbital (MO) of H 2 , electron density is increased between the nuclei.
Reason: The bonding MO is ψA+ψB , which shows destructive interference of the combining electron waves.
EASY
Which one of the following pairs of species has the same bond order?
HARD

Among the following molecules/ ions, 

C22-, N22-,O22-, O2

Which one is diamagnetic and has the shortest bond length?

HARD
Assuming 2s  2p mixing is NOT operative, the paramagnetic species among the following is
MEDIUM
Consider the following species:

(i) O 2 2

(ii) C O +

(iii) O 2 +

Among the following, sigma bond alone is present in -
HARD
Which of the following options represents the correct bond order?