HARD
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For diatomic molecules, the correct statement(s) about the molecular orbitals formed by the overlap of two 2pz orbitals is(are)

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Important Questions on Chemical Bonding and Molecular Structure

MEDIUM
In which of the following pairs of molecules/ions, both the species are not likely to exist?
EASY
Stability of the species  Li 2 , Li 2 - and Li 2 +  increases in the order of
EASY
In the molecular orbital diagram for the molecular ion N2+ , the number of electrons in the σ2p molecular orbital is
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.
HARD

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

EASY
Which one of the following pairs of species has the same bond order?
EASY
According to molecular orbital theory, which of the following is true with respect to Li2+ and Li2- ?
HARD
Which of the following options represents the correct bond order?
EASY
Which one of the following molecules is expected to exhibit paramagnetic behaviour?
MEDIUM
Which one of the following properties is not shown by NO ?
HARD
In which of the following processes, the bond order has increased and paramagnetic character has changed to diamagnetic?
MEDIUM
Consider the following species,

CN+, CN-1, NO and CN

Which one of these will have the highest bond order?
MEDIUM
The colour of the X2 molecules of group 17 elements changes gradually from yellow to violet down the group. This is due to -