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Assertion. H2 , Li2 and B2 each has a bond order of 1 and hence are equally stable.

Reason. Stability of molecule/molecular ion depends only on bond order

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Important Questions on Chemical Bonding and Molecular Structure

EASY
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters
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>Bond Parameters
Stability of the species  Li 2 , Li 2 - and Li 2 +  increases in the order of
EASY
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters
Which one of the following molecules is expected to exhibit paramagnetic behaviour?
EASY
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters
Which of the following species is not paramagnetic?
MEDIUM
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters
In which of the following pairs, the second compound is more polar than the first ? 
HARD
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters
Which of the following options represents the correct bond order?
MEDIUM
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters
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>Bond Parameters
Which one of the following pairs of species has the same bond order?
MEDIUM
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters
Two pi and half sigma bonds are present in:
HARD
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters
In which of the following processes, the bond order has increased and paramagnetic character has changed to diamagnetic?
EASY
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters
The diamagnetic species is:
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Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters

Find out the correct order of ionic character in the following molecules

i  SO2     ii  K2O     iii  N2    iv  LiF

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Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters
Consider the following species:

(i) O 2 2−

(ii) C O +

(iii) O 2 +

Among the following, sigma bond alone is present in -
MEDIUM
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters
The correct bond order in the following species is:
EASY
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters
Which of the following is paramagnetic?
MEDIUM
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters
Which of the following has unpaired electron(s)?
MEDIUM
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters
Which one of the following properties is not shown by NO ?
HARD
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters

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

EASY
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters
The most polarisable ion among the following is.
EASY
Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters
The number of π -bonds and σ -bonds present in naphthalene are respectively