Q. No.
Chlorine exists in two isotopic forms, Cl-37 and Cl-35, but its atomic mass is 35.5. This indicates the ratio of Cl-37 and Cl-35 is approximately:
1. 1:2
2. 1:1
3. 1:3
4. 3:1
Which pair of ions has the same electronic configuration?
| 1. | \(Cr^{3+}, Fe^{3+}\) | 2. | \(Fe^{3+}, Mn^{2+}\) |
| 3. | \(Fe^{3+}, Co^{3+}\) | 4. | \(Sc^{3+}, Cr^{3+}\) |
For the electrons of an oxygen atom. The correct statement among the following is :
| 1. | Zeff for an electron in a 2s orbital is the same as Zeff for an electron in a 2p orbital. |
| 2. | An electron in the 2s orbital has the same energy as an electron in the 2p orbital. |
| 3. | Zeff for an electron in 1s orbital is the same as Zeff for an electron in a 2s orbital |
| 4. | The two electrons present in the 2s orbital have same spin quantum numbers ms but of opposite sign |
Identify the matter waves with the shortest wavelength when traveling at the same speeds :
| 1. | Electron | 2. | Alpha particle (He2+) |
| 3. | Neutron | 4. | Proton |
Match the following species with their corresponding ground state electronic configuration.
| Atom/Ion | Electronic configuration | ||
| A. | Cu | 1. | |
| B. | Cu2+ | 2. | |
| C. | Zn2+ | 3. | |
| D. | Cr3+ | 4. | |
| 5. |
| A | B | C | D | |
| 1. | 4 | 2 | 5 | 1 |
| 2. | 3 | 4 | 1 | 5 |
| 3. | 3 | 2 | 1 | 4 |
| 4. | 4 | 2 | 1 | 3 |
Match the quantum numbers with the information provided by them:
| Quantum number | Information provided | ||
| A. | Principal quantum number | 1. | Orientation of the orbital |
| B. | Azimuthal quantum number | 2. | Energy and size of orbital |
| C. | Magnetic quantum number | 3. | Spin of electron |
| D. | Spin quantum number | 4. | Shape of the orbital |
| A | B | C | D | |
| 1. | 2 | 4 | 1 | 3 |
| 2. | 1 | 2 | 3 | 4 |
| 3. | 1 | 4 | 3 | 2 |
| 4. | 4 | 1 | 3 | 2 |
Match the ensuing rules with the corresponding statements:
| Rules | Statements | ||
| A. | Hund’s Rule | 1. | No two electrons in an atom can have the same set of four quantum numbers. |
| B. | Aufbau Principle | 2. | Half-filled and completely filled orbitals have extra stability. |
| C. | Pauli's Exclusion Principle | 3. | Pairing of electrons in the orbitals belonging to the same subshell does not take place until each orbital is singly occupied. |
| D. | Heisenberg’s Uncertainty Principle | 4. | It is impossible to determine the exact position and exact momentum of a subatomic particle simultaneously. |
| 5. | In the ground state of atoms, orbitals are filled in the order of their increasing energies. |
| A | B | C | D | |
| 1. | 3 | 5 | 1 | 2 |
| 2. | 1 | 2 | 3 | 4 |
| 3. | 3 | 5 | 1 | 4 |
| 4. | 4 | 5 | 3 | 2 |
Match types of wave in Column-I with the corresponding frequency in Column-II and mark the appropriate option:
|
Column-I
(Types of Wave)
|
Column-II (Corresponding Frequency) |
||
| A. | X-rays | I. | |
| B. | Ultraviolet wave (UV) | II. | |
| C. | Long radio waves | III. | |
| D. | Microwave | IV. |
| A | B | C | D | |
| 1. | IV | I | III | II |
| 2. | I | IV | II | III |
| 3. | I | IV | III | II |
| 4. | IV | III | I | II |
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