The potential energy (y) curve for H₂ formation as a function of internuclear distance (x) of the H atoms is shown below.

The bond energy of H₂ is:

1.	(b – a)	2.	\(\dfrac{\left(\right. c - a \left.\right)}{2}\)
3.	\(\dfrac{\left(\right. b - a \left.\right)}{2}\)	4.	(c – a)

How many (i) sp² hybridised carbon atoms and (ii) $\mathrm{\pi }$ bonds are present in the following compound?

During change of $O_2$ to $O_2^{-}$ ion, the electron adds in which one of the following orbitals? $$

1.  $\pi$ $\mathrm{orbital}$ $$

2.  $\sigma *$ $\mathrm{orbital}$ $$

3.  $\sigma$ $\mathrm{orbital}$

4.  $\pi *$ $\mathrm{orbital}$ $$

Four diatomic species are listed below. Identify the correct order in which the bond order is increasing in them.
1. O₂^– < NO < C₂^2– < He₂⁺  
2. C₂^2– < He₂⁺ < O₂^– < NO  
3. He₂⁺ < O₂^– < NO < C₂^2–
4. NO < O₂^– < C₂^2– < He₂⁺  

The pairs of species of oxygen and their magnetic behaviours are given below. Which of the following represents the correct description?

1. $\mathrm{O},$ ${\mathrm{O}}_2^{2-}$ - Both paramagnetic
2. ${\mathrm{O}}_2^{-},$ ${\mathrm{O}}_2^{2-}$ - Both diamagnetic
3. ${\mathrm{O}}^{+},$ ${\mathrm{O}}_2^{2-}$ - Both paramagnetic
4. ${\mathrm{O}}_2^{+},$ ${\mathrm{O}}_2$ - Both paramagnetic

Some of the properties of the two species, $N{O}_3^{-}$ $and$ $H_3{O}^{+}$  are described below. Which one of them is correct?
 

The most preferred structure among the following with the lowest energy for SO₃ is: 

1.		2.
3.		4.

Match the coordination number and type of hybridization with the distribution of hybrid orbitals in space based on Valence bond theory.

Match the compounds of Xe in Column I with the molecular structure in Column II.