Q. No.Electrons are emitted with zero velocity from a metal surface when it is exposed to radiation of wavelength 6800 Å. The work function (W0) of the metal is:
1. 3.109 × 10–20 J
2. 2.922 × 10–19 J
3. 4.031 × 1019 J
4. 2.319 × 10–18 J
Determine the maximum number of emission lines produced when an electron in a hydrogen atom transitions from the n = 6 energy level to the ground state :
1. 30
2. 21
3. 15
4. 28
The ionization energy for H atom in the ground state is \(2.18 \times10^{-18}~ \mathrm J.\) The process energy requirements will be: \(( He^+(g) \rightarrow He^{2+}(g) + e^- )\)
| 1. | \(8.72 \times10^{-18}~\mathrm J\) | 2. | \(7.54 \times10^{-18}~\mathrm J\) |
| 3. | \(5.67 \times10^{-17}~\mathrm J\) | 4. | \(2.18 \times10^{-17}~\mathrm J\) |
The ejection of the photoelectron from the silver metal can be stopped by applying a voltage of 0.35 eV when the radiation having a wavelength of 256.7 nm is used. The work function for silver metal is:
1. 3.40 eV
2. 5.18 eV
3. 4.48 eV
4. –4.40 eV
Property which is same for the following species is:
N3–, O2–, F–, Na+, Mg2+ and Al3+
1. Ionic radii
2. Number of electrons
3. Nuclear charge
4. None of the above
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 the following:
| Column I | Column II | ||
| A. | X-rays | 1. | |
| B. | Ultraviolet wave (UV) | 2. | |
| C. | Long radio waves | 3. | |
| D. | Microwave | 4. |
| A | B | C | D | |
| 1. | 4 | 1 | 3 | 2 |
| 2. | 1 | 4 | 2 | 3 |
| 3. | 1 | 4 | 3 | 2 |
| 4. | 4 | 3 | 1 | 2 |
| Assertion (A): | All isotopes of a given element show the same type of chemical behaviour. |
| Reason (R): | The chemical properties of an atom are controlled by the number of electrons in the atom. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
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