The hybridization of the central atom and the shape of ${\left[{\mathrm{lO}}_2{\mathrm{F}}_5\right]}^{2-}$ ion, respectively, are

1.  $s{p}^3{d}^3$

2.  $s{p}^2{d}^4$

3.  $s{p}^2{d}^4$

4.  $s{p}^3{d}^3$

Which of the following contain a maximum number of electrons in the antibonding molecular orbitals?

Which of the following compounds has the least tendency to form hydrogen bonds between molecules?

1.  ${\mathrm{NH}}_3$

2.  ${\mathrm{H}}_2\mathrm{NOH}$

3.  HF

4.  ${\mathrm{CH}}_3\mathrm{F}$

Assuming that Hund's rule is violated by the diatomic molecule $B_2$, its bond order and magnetic nature will be respectively

1.  1, diamagnetic

2.  1, paramagnetic

3.  2, diamagnetic

4.  2, paramagnetic

In the Lewis structure of ozone $\left({\mathrm{O}}_3\right)$ the formal charge on the central oxygen atom is:  

1.  +1

2.  -1

3.  0

4.  -2

The types of hybrid orbitals of nitrogen in ${\mathrm{NO}}_2^{+}, {\mathrm{NO}}_3^{-}, \mathrm{and} {\mathrm{NH}}_4^{+}$ respectively, are expected to be:

1. $\mathrm{sp}, {\mathrm{sp}}^{3 } \mathrm{and} {\mathrm{sp}}^2$

2. $\mathrm{sp}, {\mathrm{sp}}^2 \mathrm{and} {\mathrm{sp}}^3$

3. ${\mathrm{sp}}^2, \mathrm{sp} \mathrm{and} {\mathrm{sp}}^3$

4. ${\mathrm{sp}}^{2 }, {\mathrm{sp}}^3 \mathrm{and} \mathrm{sp}$

Which of the following species has tetrahedral geometry(shape)?

1. ${\mathrm{BH}}_{4_{}}^{-}$

2. ${\mathrm{NH}}_2^{-}$

3. ${\mathrm{CO}}_3^{2-}$

4. ${\mathrm{H}}_3{\mathrm{O}}^{+}$

Which molecule /ion out of the following does not contain unpaired electrons?

1. ${\mathrm{N}}_2^{+}$

2. ${\mathrm{O}}_2$

3. ${\mathrm{O}}_2^{2-}$

4. ${\mathrm{B}}_2$

Which of the following order of energies of molecular orbitals of  ${\mathrm{N}}_2$  is correct?

1. $\left(\mathrm{\pi }2{\mathrm{p}}_{\mathrm{y}}\right) < \left(\sigma 2p_z\right) < \left({\mathrm{\pi }}^{*}2{\mathrm{p}}_{\mathrm{x}}\right) \approx \left({\mathrm{\pi }}^{*}2{\mathrm{p}}_{\mathrm{y}}\right)$

2. $\left(\mathrm{\pi }2{\mathrm{p}}_{\mathrm{y}}\right) > \left(\sigma 2p_z\right) > \left({\mathrm{\pi }}^{*}2{\mathrm{p}}_{\mathrm{x}}\right) \approx \left(\mathrm{\pi }*2{\mathrm{p}}_{\mathrm{y}}\right)$

3. $\left(\mathrm{\pi }2{\mathrm{P}}_{\mathrm{y}}\right) < \left(\sigma 2p_z\right) > \left(\mathrm{\pi }*2{\mathrm{p}}_{\mathrm{x}}\right) \approx \left(\mathrm{\pi }2{\mathrm{p}}_{\mathrm{y}}\right)$

4. $\left(\mathrm{\pi }2{\mathrm{p}}_{\mathrm{y}}\right) > \left(\sigma 2p_z\right) < \left(\mathrm{\pi }*2{\mathrm{p}}_{\mathrm{x}}\right) \approx \left(\mathrm{\pi }*2{\mathrm{p}}_{\mathrm{y}}\right)$