InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Correct set of four quantum numbers for the valence (outermost) electron of rubidium `(Z = 37)` isA. `5,0,0,+1/2`B. `5,1,0,+1/2`C. `5,1,1,+1/2`D. `6,0,0,+1/2` |
| Answer» Correct Answer - A | |
| 52. |
The correct order of electron gain enthalpy with negative sign of F.Cl.Br and I, having atomic 9,17,35, and 53 respectively, is :A. `IgtBrgtClgtF`B. `FgtClgtBrgtI`C. `ClgtFgtBrgtI`D. `BrgtClgtIgtF` |
| Answer» Correct Answer - C | |
| 53. |
Which of the following factors may be regarded as the main cause of lanthanide contraction ?A. poor shielding of one of 4f electron by another in the subshellB. effective shielding of one of 4f electrons by another in the subshellC. poorer shielding of 5d electrons by 4f electronsD. greater shielding of 5d electrons by 4f electrons |
| Answer» Correct Answer - A C | |
| 54. |
Which of the following statement is correct in relation to the hydrogen atom :A. 3s ,3p and 3d orbitals all have the same energyB. 3s and 3p orbitals are of lower energy than 3d orbitalsC. 3p orbital is lower in energy than 3d orbitalD. 3s orbitals is lower in energy than 3p orbital |
| Answer» Correct Answer - A | |
| 55. |
Of the following sets which one does not contain isoclectronic species ?A. `BO_(3)^(3-),CO_(3)^(2-),NO_(3)^(-)`B. `SO_(3)^(2-),CO_(3)^(2-),NO_(3)^(-)`C. `CN^(-),N_(2),C_(2)^(2-)`D. `PO_(4)^(3-),SO_(4)^(2-),CIO_(4)^(-)` |
| Answer» Correct Answer - B | |
| 56. |
In a multi-electron alom, which of the following orbitals described by the three quantum members will have the same energy in the absence of magnetic and electric fields ?A. (D) and (E)B. (C) and (D)C. (B) and (C)D. (A) and (B) |
| Answer» Correct Answer - A | |
| 57. |
The formation of the oxide ion `O_((g))^(2-)` requires first an exothermic and then an endothermic step as shown below. `O_((g)) +e^(-) = O_((g))^(-) DeltaH^(@) =- 142 kJ mol^(-1)` `O_((g))^(-) + e^(-) = O_((g))^(2-) DeltaH^(@) = 844 kJ mol^(-1)` This is because of :A. `O^(-)` ion will tend to resist the addition of another electronB. Oxygen has high electron affinityC. Oxygen is more electronegativeD. `O^(-)` ion has comparitively larger size than oxygen atom |
| Answer» Correct Answer - A | |