Q. No.Which of the following Molecular Orbital Theory explanations best accounts for the instability of the Be2 molecule?
1. The bond order of Be2 is one.
2. The bond order of Be2 is negative.
3. The bond order of Be2 is zero.
4. The bond order of Be2 is two.
Why are axial bonds in PCl₅ longer than equatorial bonds?
| 1. | Axial bond pairs suffer more repulsion from the equatorial bond pairs |
| 2. | Equatorial bond pairs suffer more repulsion from the axial bond pairs |
| 3. | Both 1 and 2 |
| 4. | None of the above |
The relation between hydrogen bond and the van der Waals forces is:
| 1. | Both the bonds have equal strength. |
| 2. | Hydrogen bonds are weaker than van der Waals forces. |
| 3. | Hydrogen bonds are stronger than van der Waals forces. |
| 4. | None of the above |
The significance of the octet rule is:
1. To determine the stability of atoms.
2. To find the hybridization of elements.
3. To calculate the number of lone pairs.
4. None of the above.
The incorrect statement among the following is:
| 1. | The sigma bond forms via head-on overlap, and the pi bond forms via sidewise overlapping of orbitals. |
| 2. | s and p orbitals combine to form a sigma bond as well as a pi bond. |
| 3. | Hybrid orbitals form sigma bonds only. |
| 4. | Sigma bonds are stronger than pi bonds. |
Which of the following is the correct lewis dot structure for acetic acid?
| 1. |  |
2. |  |
| 3. |  |
4. | None of the above |
H2 molecule on the basis of valence bond theory is formed due to:
1. Attractive forces being more than the repulsive forces.
2. Attractive forces being less than the repulsive forces.
3. No force of attraction.
4. Only repulsive force.
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