According to Valence Bond Theory, H₂ molecule formation is favoured when:

1. Attractive forces are greater than repulsive forces.
2. Attractive forces are less than repulsive forces.
3. No attractive force acts between the atoms.
4. Only repulsive forces act between the atoms.

Hybridization of C₁ and C₂  in the structure given below are

1. ${\mathrm{C}}_1<mspace\; width="1em"></mspace>=<mspace\; width="1em"></mspace>{\mathrm{sp}}^3<mspace\; width="1em"></mspace>,<mspace\; width="1em"></mspace>{\mathrm{C}}_2=<mspace\; width="1em"></mspace>{\mathrm{sp}}^2$

2. ${\mathrm{C}}_1<mspace\; width="1em"></mspace>=<mspace\; width="1em"></mspace>{\mathrm{sp}}^3<mspace\; width="1em"></mspace>,<mspace\; width="1em"></mspace>{\mathrm{C}}_2=<mspace\; width="1em"></mspace>{\mathrm{sp}}^3$

3. ${\mathrm{C}}_1<mspace\; width="1em"></mspace>=<mspace\; width="1em"></mspace>{\mathrm{sp}}^2<mspace\; width="1em"></mspace>,<mspace\; width="1em"></mspace>{\mathrm{C}}_2=<mspace\; width="1em"></mspace>{\mathrm{sp}}^3$

4. ${\mathrm{C}}_1<mspace\; width="1em"></mspace>=<mspace\; width="1em"></mspace>{\mathrm{sp}}^2<mspace\; width="1em"></mspace>,<mspace\; width="1em"></mspace>{\mathrm{C}}_2=<mspace\; width="1em"></mspace>{\mathrm{sp}}^2$

Consider the following structure.

The hybridization of C₁, and C₂ carbon in the structure are -

1. $C_1$ = ${\mathrm{sp}}^2$ , ${\mathrm{C}}_2$ =  $s{p}^2$

2. $C_1$ = ${\mathrm{sp}}^3$ , ${\mathrm{C}}_2$ = ${\mathrm{sp}}^3$

3. $C_1$ = ${\mathrm{sp}}^3$ , ${\mathrm{C}}_2$ = ${\mathrm{sp}}^2$

4. None of the above

The number of resonating structures exhibited by \(CO^{2-}_3\) ion are :

The condition(s) required for the linear combination of atomic orbital is :

The following graph captures potential energy on the y-axis for hydrogen gas formation as a function of the internuclear distance on the x-axis:
        
The bond energy of H₂ can be represented by:

BF₃ is a planar and an electron deficient compound. Hybridization and number of electrons around the central atom, respectively are: 

Match List-I with List-II

Choose the correct answer from the options given below:

Which pair of ions among the following list do not constitute an iso-electronic pair?

1. Mn²⁺, Fe³⁺

2. Fe²⁺, Mn²⁺

3. O^2–, F^–

4. Na⁺, Mg²⁺

Which molecule among the following is non-polar?