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Which of the following is paramagnetic as well as it has fractional bond order ? 

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Important Questions on Chemical Bonding and Molecular Structure

EASY
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Molecular Orbital Theory
Which one of the following molecules is expected to exhibit paramagnetic behaviour?
HARD
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Molecular Orbital Theory

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

MEDIUM
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Molecular Orbital Theory
In which of the following pairs of molecules/ions, both the species are not likely to exist?
EASY
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Molecular Orbital Theory
Which of the following species is not paramagnetic?
MEDIUM
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Molecular Orbital Theory
A homonuclear diatomic gas molecule shows 2-electron magnetic moment. The one-electron and two-electron reduced species obtained from above gas molecule can act as both oxidising and reducing agents. When the gas molecule is one-electron oxidised the bond length decreases compared to the neutral molecule. The gas molecule is
MEDIUM
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Molecular Orbital Theory
The correct bond order in the following species is:
EASY
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Molecular Orbital Theory
Stability of the species  Li 2 , Li 2 - and Li 2 +  increases in the order of
MEDIUM
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Molecular Orbital Theory
Which one of the following properties is not shown by NO ?
HARD
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Molecular Orbital Theory
According to Molecular Orbital Theory,
MEDIUM
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Molecular Orbital Theory
Two pi and half sigma bonds are present in:
EASY
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Molecular Orbital Theory
The diamagnetic species is:
MEDIUM
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Molecular Orbital Theory
Which of the following show maximum bond-order? 
EASY
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Molecular Orbital Theory
Which of the following is paramagnetic?
EASY
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Molecular Orbital Theory
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
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Molecular Orbital Theory
Which one of the following pairs of species has the same bond order?
MEDIUM
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Molecular Orbital Theory
Which one of the following molecules is paramagnetic?
MEDIUM
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Molecular Orbital Theory
Which of the following has unpaired electron(s)?
HARD
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Molecular Orbital Theory
In which of the following processes, the bond order has increased and paramagnetic character has changed to diamagnetic?
MEDIUM
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Molecular Orbital Theory
Bond order of He2 , He2+ and He22+ are respectively
MEDIUM
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Molecular Orbital Theory
Consider the following species:

(i) O 2 2−

(ii) C O +

(iii) O 2 +

Among the following, sigma bond alone is present in -