MCQOPTIONS
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MCQOPTIONS
This section includes 16 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The interaction between a pair of orbitals of the same type is _________ |
| A. | Attractive |
| B. | Repulsive |
| C. | There is no interaction |
| D. | None of the mentioned |
| Answer» C. There is no interaction | |
| 2. |
Choose the incorrect option from the following. |
| A. | Valence bond theory does not explain the paramagnetic nature of O2 |
| B. | Molecular orbital theory explains the extra stability of O2+ cation over O2 |
| C. | Valence bond theory explains the ionization or gain of electrons, giving O2+ and O2– ions, if O2 has the stable octet |
| D. | Resonance has no role in Molecular orbital theory |
| Answer» D. Resonance has no role in Molecular orbital theory | |
| 3. |
The combination of H (1s1) and F (2px1) gives _________ |
| A. | Bonding orbital |
| B. | Antibonding orbital |
| C. | Both bonding and antibonding orbital |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 4. |
Calculate the number of σ and π bonds in cyclohexadiene. (C6H8) |
| A. | σ bond = 2, π bond = 14 |
| B. | σ bond = 14, π bond = 2 |
| C. | σ bond = 12, π bond = 2 |
| D. | σ bond = 12, π bond = 4 |
| Answer» C. σ bond = 12, π bond = 2 | |
| 5. |
The molecular orbital electronic configuration of HF molecule is _________ |
| A. | 1s2 2s2 σspx2 [2py2 2pz2] σspx* |
| B. | 1s2 2s2 σspx2 [2px2 2py2] σspx* |
| C. | 1s2 2s2 σspx2 [2px2 2pz2] σspx* |
| D. | 1s2 2s2 σspx2 [2px4] σspx* |
| Answer» B. 1s2 2s2 σspx2 [2px2 2py2] σspx* | |
| 6. |
Bond order of NO+ molecule is _________ |
| A. | 2 |
| B. | 3 |
| C. | 2.5 |
| D. | 4 |
| Answer» C. 2.5 | |
| 7. |
THE_INTERACTION_BETWEEN_A_PAIR_OF_ORBITALS_OF_THE_SAME_TYPE_IS?$ |
| A. | Attractive |
| B. | Repulsive |
| C. | There is no interaction |
| D. | None of the mentioned |
| Answer» C. There is no interaction | |
| 8. |
Which of the following molecules have bond order equal to 1? |
| A. | NO, HF, HCl, Li<sub>2</sub>, CO |
| B. | H<sub>2</sub>, Li<sub>2</sub>, B<sub>2</sub>, HF, HCl |
| C. | Li<sub>2</sub>, B<sub>2</sub>, CO, NO,He<sub>2</sub><sup>+</sup> |
| D. | B<sub>2</sub>, CO, He<sub>2</sub><sup>+</sup>, NO, HF |
| Answer» C. Li<sub>2</sub>, B<sub>2</sub>, CO, NO,He<sub>2</sub><sup>+</sup> | |
| 9. |
Choose the incorrect option from the following. |
| A. | Valence bond theory does not explain the paramagnetic nature of O<sub>2</sub> |
| B. | Molecular orbital theory explains the extra stability of O<sub>2</sub><sup>+</sup> cation over O<sub>2</sub> |
| C. | Valence bond theory explains the ionization or gain of electrons, giving O<sub>2</sub><sup>+</sup> and O<sub>2</sub><sup>–</sup> ions, if O<sub>2</sub> has the stable octet |
| D. | Resonance has no role in Molecular orbital theory |
| Answer» D. Resonance has no role in Molecular orbital theory | |
| 10. |
The combination of H (1s1) and F (2px1) gives |
| A. | Bonding orbital |
| B. | Antibonding orbital |
| C. | Both bonding and antibonding orbital |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 11. |
Calculate the number of σ and π bonds in cyclohexadiene. (C6H8)$ |
| A. | σ bond = 2 π bond = 14 |
| B. | σ bond = 14 π bond = 2 |
| C. | σ bond = 12 π bond = 2 |
| D. | σ bond = 12 π bond = 4 |
| Answer» C. ‚âà√¨‚àö√¢ bond = 12 ‚âà√¨‚àö√ë bond = 2 | |
| 12. |
From the following options, choose the heteronuclear diatomic molecules which are paramagnetic in nature? |
| A. | HF and NO |
| B. | HF and O<sub>2</sub> |
| C. | NO and O<sub>2</sub> |
| D. | Only NO |
| Answer» E. | |
| 13. |
The molecular orbital electronic configuration of HF molecule is |
| A. | 1s<sup>2</sup> 2s<sup>2</sup> σ<sub>spx</sub><sup>2</sup> [2<sub>py</sub><sup>2</sup> 2<sub>pz</sub><sup>2</sup>] σ<sub>spx</sub>* |
| B. | 1s<sup>2</sup> 2s<sup>2</sup> σ<sub>spx</sub><sup>2</sup> [2<sub>px</sub><sup>2</sup> 2<sub>py</sub><sup>2</sup>] σ<sub>spx</sub>* |
| C. | 1s<sup>2</sup> 2s<sup>2</sup> σ<sub>spx</sub><sup>2</sup> [2<sub>px</sub><sup>2</sup> 2<sub>pz</sub><sup>2</sup>] σ<sub>spx</sub>* |
| D. | 1s<sup>2</sup> 2s<sup>2</sup> σ<sub>spx</sub><sup>2</sup> [2<sub>px</sub><sup>4</sup>] σ<sub>spx</sub>* |
| Answer» B. 1s<sup>2</sup> 2s<sup>2</sup> ‚âà√¨‚àö√¢<sub>spx</sub><sup>2</sup> [2<sub>px</sub><sup>2</sup> 2<sub>py</sub><sup>2</sup>] ‚âà√¨‚àö√¢<sub>spx</sub>* | |
| 14. |
Which of the following molecule is least stable? |
| A. | NO<sup>+</sup> |
| B. | N<sub>2</sub> |
| C. | NO |
| D. | O<sub>2</sub> |
| Answer» D. O<sub>2</sub> | |
| 15. |
Bond order of NO+ molecule is |
| A. | 2 |
| B. | 3 |
| C. | 2.5 |
| D. | 4 |
| Answer» C. 2.5 | |
| 16. |
Which of the following molecule is not homonuclear? |
| A. | H<sub>2</sub> |
| B. | N<sub>2</sub> |
| C. | NO |
| D. | O<sub>2</sub> |
| Answer» D. O<sub>2</sub> | |