Molecular Orbital Theory

The number and type of bonds between two carbon atoms in calcium carbide are

How many of the following species have the bond order $2$ ?
${\mathrm{C}}_2, {\mathrm{B}}_2^{2-},{\mathrm{N}}_2^{2+},{\mathrm{CN}}^{+},{\mathrm{NO}}^{-},{\mathrm{O}}_2,{\mathrm{C}}_2^{+}$

Over lapping of $2\mathrm{p}$ orbitals of two atoms forms how many molecular orbitals between two atoms?

Which of the following are the molecular orbitals formed from the overlapping of $1\mathrm{s}$ atomic orbitals?

The energy level of an orbit is determined by the _____ value of that particular orbit.

Assertion. Molecular nitrogen is less reactive than molecular oxygen.

Reason. The bond length of ${\mathrm{N}}_2$ is shorter than that of oxygen

Assertion : ${\mathrm{H}}_2$ molecule is more stable than $\mathrm{HeH}$ molecule.

Reason : The anti bonding electron in the molecule destabilises it.

The bond formed in between boron atoms based on molecular orbital theory is 

The number of anti-bonding electrons in the beryllium molecule is

Shape of p_x-orbital and s-orbital is _____ respectively.

Atomic number of $\mathrm{Cr}, \mathrm{Fe}$ and $\mathrm{Co}$ are $24, 26$ and $27$ respectively. Which of the following inner orbital octahedral complexes are paramagnetic?

Arrange the following species in the correct order of their stabilities.

${\mathrm{N}}_2^{-},{\mathrm{C}}_2,{\mathrm{Ne}}_2,{\mathrm{O}}_2^{2-}$

In which of the following ionization processes the bond energy increases and the magnetic behaviour changes from paramagnetic to diamagnetic?

Addition an electron to an Antibonding molecular orbital _____

According to "Molecular orbital theory", which among the following diatomic molecules only has $\pi$-bonds?

Write the salient features of molecular orbitals.