Valence Bond Theory

Q.

Find the ratio of no. of pure and hybrid orbitals in benzene with clear explanation and structure.

Q. 38.The number of radial nodes in 4s and 3p orbital are respectively 2, 0 3, 1 2, 2 3, 2

Q. 88. What is the difference between gram atom and gram molecule

Q. 16. Why pz and dz2 orbitals having m values zero?

Q. The correct structure of $Fe(CO{)}_5$ is :

1. trigonal bipyramidal
2. octahedral
3. tetrahedral
4. square pyramidal

Q.

• Stronger intermolecular forces result in higher boiling point.
• Strength of London forces increases with the number of electrons in the molecule.
• Boiling point of $HF,HCl,HBr$ and $HI$ are $293K,189K,206K$ and $238K$ respectively.

A Which type of intermolecular forces are present in the molecules $HF,HCl,HBr$ and $HI$?

B Looking at the trend of boiling points of $HCl,HBr$ and $HI$, explain out of dipole-dipole interactions and London interaction, which one is predominant here.

C Why is the boiling point of hydrogen fluoride highest while that of hydrogen chloride lowest?

Q. total no of angular nodes present in 3dx^2-y^2 and 3dz^2 orbital respectively is

Q. The number of nodal planes in 4d subshell is 8 . The number of nodal planes in 4d orbital is 2 except in dz^2. Are the above 2 statements right ?

Q. How to calculate total number of nodes and nodal planes in a structure of hybrid orbital?

Q. 7.Bond Order of ClO4-

Q. which is more electronegative cl- or oh

Q.

Explain Valance Bond Theory

Q.

Write the molecular orbital configuration of N₂ and N₂⁺ . Also calculate their bond order?

Q.

Which of the following orbitals give a zero overlap?

1. p_x-p_y

2. p_x-p_x

3. p_z-p_z

4. p_y-p_y

Q. in which at least one sigma bond of np(sigma np) orbital is present 1.B2 2.O2 3.C2 4.LI2

Q. Which of the following orbitals is not directed along the axis? IN d orbitals ?

Q.

The following diagram represents

1. p-orbital

2. d-orbital

3. f-orbital

4. s-orbital

Q. 30. Which orbital overlap is strongest? 2p, -2p, overlap 2s- 2s overlap sp -2p p, -p, overlap

Q. 10.How many d orbitals ar einvolved in the formation of XeO3F2

Q. 7. What 8s the meaning of degenerate orbitals?

Q. 25. how many number of nodes present in 6s, 7p- orbitals

Q. 62 Which of the following molecules has the maximum number of A-X bonds of identical length, where A is the central atom and X is the surrounding atom: a)SF6 b)IF7 c)PF5 d)ClO4

Q. The number of nodal planes in 4d subshell is 8 . The number of nodal planes in 4d orbital is 2 except in dz^2. Are the above 2 statements right ?

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

1. False
2. True

Q. 24.A:The radius of second orbit of He+ is equal to that of first orbit of hydrogen. B: The radius of an orbit in hydrogen like species is directly proportional to n and Inversely proportional to Z.

Q.

What is the use of the Valence bond theory?

Q.

Valence bond theory was introduced by:

1. Gillespie

2. Lewis

3. Pauling

4. Heitler

Q. Eectrons involved when 1 mole h2o2 changes to

Q.

Name the molecule whose structure are not explained by VBT?

Q. How many dπ – pπ overlapping is present in SNF₃?

SNF₃ में कितने dπ – pπ अतिव्यापन होते हैं?

1. 2
2. 1
3. 0
4. 3