EASY
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How many species have unpaired electrons?

O2, O2-, O22-, CN-

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Important Questions on Chemical Bonding

EASY
Which of the following is paramagnetic?
HARD

Decreasing order of stability of O2, O2-, O2+ and O22- 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
In which of the following processes, the bond order has increased and paramagnetic character has changed to diamagnetic?
MEDIUM
In which of the following pairs of molecules/ions, both the species are not likely to exist?
EASY
Which one of the following pairs of species has the same bond order?
MEDIUM
According to molecular orbital theory, which of the following molecule will not be available?
EASY
Stability of the species  Li 2 , Li 2 - and Li 2 +  increases in the order of
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
Which of the following has unpaired electron(s)?
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.
MEDIUM
Which one of the following molecules is paramagnetic?
MEDIUM
The colour of the X2 molecules of group 17 elements changes gradually from yellow to violet down the group. This is due to -
HARD
Assuming 2s  2p mixing is NOT operative, the paramagnetic species among the following is
EASY
Which of the following species is not paramagnetic?
MEDIUM
The correct bond order in the following species is:
MEDIUM
Two pi and half sigma bonds are present in: