Valence Bond Theory

Q.

Which among the following are the repulsive forces acting between two atoms A and B?
If $e_A$, $e_B$ represents electrons of atom A and B respectively and $N_A$, $N_B$ represents nuclei of atom A and B respectively.

1. $e_A-e_B$
2. $N_A-N_B$
3. $N_A-e_B$
4. $N_B-e_A$

Q. In V.B.T., the idea of hybridization was required to explain which of the following facts:

1. The equivalence of the bonds in most of the compounds
2. The stereochemistry of the molecules
3. The better overlapping of the orbitals
4. None of these

Q.

According to valence bond theory, a bond between two atoms is formed when

1. fully-filled atomic orbitals overlap

2. non-bonding atomic orbitals overlap

3. half-filled atomic orbitals overlap

4. electrons of the two atoms overlap

Q.

Valence bond theory was proposed by

1. Harrison ford

2. Rutherford

3. Henry Ford

4. Heitler and London

Q. Valence Bond Theory cannot explain paramagnetic nature of oxygen molecule.

1. False
2. True

Q. The ratio of $\sigma$- to $\pi$-bonds in benzene is .

1. 2
2. 4
3. 6

Q. An aqueous solution of $CoC{l}_3.6N{H}_3$ on mixing with $AgN{O}_3$ produces $3$ moles of a white precipitate. Primary and secondary valency of the metal in this complex is:

1. $3,6$
2. $2,6$
3. $6,4$
4. $3,3$

Q. Which of the following statements is correct regarding the Valence Bond theory?

1. Covalent bonds are formed when two valence orbitals (half-filled) belonging to two different atoms overlap with each other
2. The unpaired electrons in the valence shell participate in the formation of a chemical bond
3. Formation of a covalent bond leads to the stability of molecule
4. All of the above.

Q. Which of the following overlaps gives a $\sigma$ bond with x as the internuclear axis?

1. $p_z$ and $p_z$
2. s and $p_z$
3. s and $p_x$
4. $d_{x^2-y^2}$ and $d_{x^2-y^2}$

Q.

Explain the formation of $H_2$ molecule on the basis of valence bond theory.