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The decreasing order of stability of $O_{2}, O_{2}^{-}, O_{2}^{+}$ $and$ $O_{2}^{2 -}$ is:

1. $O_{2}^{+} > O_{2} > O_{2}^{-} > O_{2}^{2 -}$

2. $O_{2}^{2 -} > O_{2}^{-} > O_{2} > O_{2}^{+}$

3. $O_{2} > O_{2}^{+} > O_{2}^{2 -} > O_{2}^{-}$

4. $O_{2}^{-} > O_{2}^{2 -} > O_{2}^{+} > O_{2}$

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A pair in which both species are not likely to exist is:

1.	$H^+_2,He^{2-}_2$	2.	$H^-_2,He^{2+}_2$
3.	$H^{2+}_2,He_2$	4.	$H^+_2,He^{2+}_2$

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Combination of atoms A and B that forms an anti-bonding molecular orbital is :

1. $\frac{Ψ_{A}^{2}}{Ψ_{B}^{2}}$

2. $Ψ_{A}^{2} \times Ψ_{B}^{2}$

3. $Ψ_{A} + Ψ_{B}$

4. $Ψ_{A} - Ψ_{B}$

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From the perspective of molecular orbital theory, which statement is false?

1.	${Be}_{2}$ is not a stable molecule.
2.	${He}_{2}$ is not stable but ${He}_{2}^{+}$ is expected to exist.
3.	Bond strength of $N_{2}$ is maximum amongst the homonuclear diatomic molecules belonging to the second period.
4.	The order of energies of molecular orbitals in $N_{2}$ molecule is: $σ_{2 s} < σ_{2 s}^{} < σ_{2 p_{z}} < (π_{2 p_{x}} \approx π_{2 p_{y}})$ $< (π_{2 p_{x}}^{} \approx π_{2 p_{y}}^{}) < σ_{2 p_{z}}^{}$

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In which of the following ionization processes the bond energy increases and the magnetic behaviour changes from paramagnetic to diamagnetic?
1. $\mathrm{O_{2}\rightarrow O_{2}^{+} }$
2. $\mathrm{C_{2}\rightarrow C_{2}^{+} }$
3. $\mathrm{NO\rightarrow NO^{+} }$
4. $\mathrm{N_{2}\rightarrow N_{2}^{+} }$

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1.	\(H^+_2,He^{2-}_2\)	2.	\(H^-_2,He^{2+}_2\)
3.	\(H^{2+}_2,He_2\)	4.	\(H^+_2,He^{2+}_2\)

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