The excited electronic state of ${\mathrm{H}\mathrm{e}}_2$ does not have

Important Questions on Chemical Bonding and Molecular Structure

MEDIUM

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bonding in Some Homonuclear Diatomic Molecules

The correct bond order in the following species is:

MEDIUM

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bonding in Some Homonuclear Diatomic Molecules

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>Bonding in Some Homonuclear Diatomic Molecules

After understanding the assertion and reason, choose the correct option.

Assertion: In the bonding molecular orbital (MO) of ${\text{H}}_2,$ electron density is increased between the nuclei.
Reason: The bonding MO is ${\mathrm{\text{ψ}}}_{\mathrm{\text{A}}}+{\mathrm{\text{ψ}}}_{\mathrm{\text{B}}}$ , which shows destructive interference of the combining electron waves.

MEDIUM

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bonding in Some Homonuclear Diatomic Molecules

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>Bonding in Some Homonuclear Diatomic Molecules

Two pi and half sigma bonds are present in:

EASY

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bonding in Some Homonuclear Diatomic Molecules

Which of the following species is not paramagnetic?

EASY

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bonding in Some Homonuclear Diatomic Molecules

Which one of the following molecules is expected to exhibit paramagnetic behaviour?

MEDIUM

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bonding in Some Homonuclear Diatomic Molecules

Which one of the following properties is not shown by NO ?

HARD

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bonding in Some Homonuclear Diatomic Molecules

In which of the following processes, the bond order has increased and paramagnetic character has changed to diamagnetic?

HARD

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bonding in Some Homonuclear Diatomic Molecules

Decreasing order of stability of ${\mathrm{O}}_2,\mathrm{ }{\mathrm{O}}_2^{-},\mathrm{ }{\mathrm{O}}_2^{+}$ and ${\mathrm{O}}_2^{2-}$ is:

EASY

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bonding in Some Homonuclear Diatomic Molecules

The diamagnetic species is:

MEDIUM

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bonding in Some Homonuclear Diatomic Molecules

Bond order of ${\mathrm{He}}_2 , {\mathrm{He}}_2^{+}$ and ${\mathrm{He}}_2^{2+}$ are respectively

EASY

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bonding in Some Homonuclear Diatomic Molecules

Which of the following is paramagnetic?

HARD

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bonding in Some Homonuclear Diatomic Molecules

Which of the following options represents the correct bond order?

EASY

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bonding in Some Homonuclear Diatomic Molecules

Which one of the following pairs of species has the same bond order?

MEDIUM

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bonding in Some Homonuclear Diatomic Molecules

Which one of the following molecules is paramagnetic?

MEDIUM

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bonding in Some Homonuclear Diatomic Molecules

Which of the following has unpaired electron(s)?

EASY

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bonding in Some Homonuclear Diatomic Molecules

Stability of the species  ${\text{Li}}_2\text{,}{\text{Li}}_2^{-}\text{and}{\text{Li}}_2^{+}$ increases in the order of

MEDIUM

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bonding in Some Homonuclear Diatomic Molecules

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>Bonding in Some Homonuclear Diatomic Molecules

Which of the following show maximum bond-order?