Molecular Orbitals of Oxygen

Q.

Which of the following species is the least stable

1. 

2. 

3. 

4. 

Q. The correct electronic configuration for $H_2^{-}$ is:

1. $\sigma \left({1s}^1\right){\sigma }^{\ast }({1s}^1$)
2. $\sigma {1s}^3$
3. $\sigma \left({1s}^2\right){\sigma }^{\ast }\left(1s^1\right)$
4. $\sigma {1s}^2$

Q.

In $O_2^{-}$, $O_{2}and{O}_2^{2-}$ molecular species, the total number of anti-bonding electrons respectively are:

1. 7, 6, 8

2. 1, 0, 2

3. 6, 6, 6

4. 8, 6, 8

Q.

In $O_2^{-}$, $O_{2}and{O}_2^{2-}$ molecular species, the total number of anti-bonding electrons respectively are:

1. 7, 6, 8

2. 1, 0, 2

3. 6, 6, 6

4. 8, 6, 8