Q. No.
Which of the following is the correct electronic configuration of the element belonging to Group 15 and Period 3 of the periodic table?
1. \(\mathrm{1 s^2 2 s^2 2 p^4} \)
2. \(\mathrm{1 s^2 2 s^2 2 p^3} \)
3. \(\mathrm{1 s^2 2 s^2 2 p^6 3 s^2 3 p^2} \)
4. \(\mathrm{1 s^2 2 s^2 2 p^6 3 s^2 3 p^3}\)
Which of the following statements is false?
| 1. | Xe is the most reactive among the rare gases. |
| 2. | He is an inert gas. |
| 3. | Radon is obtained from the decay of radium. |
| 4. | The most abundant rare gas found in the atmosphere is He. |
Which of the following equations correctly represents the catalytic oxidation of ammonia by atmospheric oxygen ?
| 1. | 4NH3 + \(\underset{\text{From air}}{5O_2} \) \(\xrightarrow[\text{500 K; 9 bar}]{\text{Pt / Rh gauge catalyst}}\) 4NO + 6H2O |
| 2. | 3NH4 + \(\underset{\text{From air}}{5O_2} \) \(\xrightarrow[\text{500 K; 9 bar}]{\text{Pt / Rh gauge catalyst}}\) 3NO + 6H2O |
| 3. | 4NH3 + \(\underset{\text{From air}}{5O_2} \) \(\xrightarrow[\text{cold}]{\text{no catalyst}}\) 4NO + 6H2O |
| 4. | 3NH4 + \(\underset{\text{From air}}{5O_2} \) \(\xrightarrow[\text{cold}]{\text{no catalyst}}\) 3NO + 6H2O |
Which of the following correctly explains why NH₃ is highly soluble in water, whereas PH₃ is only sparingly soluble?
| 1. | NH3 forms an H-bond with water, so it is soluble but PH3 does not form an H-bond. |
| 2. | NH3 does not form an H-bond with water, so it is soluble but PH3 does form an H-bond. |
| 3. | NH3 and PH3 both form H-bond with water. |
| 4. | NH3 and PH3 both do not form H-bond with water. |
Which of the following correctly explains why all five P–Cl bonds in PCl₅ are not equivalent?
| 1. | Equatorial bond pairs suffer more repulsion as compared to axial bond pairs. |
| 2. | Axial bond pairs suffer more repulsion as compared to equatorial bond pairs. |
| 3. | Axial and equatorial bond pairs suffer more repulsion. |
| 4. | None of the above. |
Which of the following correctly explains why NO₂ is paramagnetic in the gaseous state but diamagnetic in the solid state?
| 1. | NO2 exists as a dimer in a gaseous as well as solid state. |
| 2. | NO2 exists as a monomer in a gaseous as well as solid state. |
| 3. | NO2 exists as a dimer in a gaseous state and it becomes a monomer in solid state. |
| 4. | NO2 exists as a monomer in a gaseous state and it becomes dimerized in solid state. |
Which of the following correctly compares the bond angles of H₂O and H₂S?
1. Both have the same bond angle.
2. Bond angle of H2O is larger than that of H2S
3. Bond angle of H2O is smaller than that of H2S
4. None of the above.
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