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Q. No.Which one of the following sets of quantum numbers is not possible for 4p electron ?
1. \(n=4, l=1, m=-1, m_s=+\frac{1}{2}\)
2. \(n=4, l=1, m=0, m_s=+\frac{1}{2}\)
3. \(n=4, l=1, m=2, m_s=+\frac{1}{2}\)
4. \(n=4, l=1, m=-1, m_s=-\frac{1}{2}\)
Subtopic: Quantum Numbers & Schrodinger Wave Equation |
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Match List-I with List-II:
1. A–I, B–II,III , C–III, and D–IV
2. A–III, B–III, C–II and IV, D–I and IV
3. A–I, B–II, C–III and IV, D–IV
4. A–III, B–III, C–IV, D–I and IV
| List-I | List-II | ||
| A. | Photon | I. | Value is 4 for N shell |
| B. | Electron | II. | Probability density |
| C. | \(\psi^2\) | III. | Exhibits both momentum and wavelength |
| D. | Principal quantum number | IV. | Always positive |
1. A–I, B–II,III , C–III, and D–IV
2. A–III, B–III, C–II and IV, D–I and IV
3. A–I, B–II, C–III and IV, D–IV
4. A–III, B–III, C–IV, D–I and IV
Subtopic: AUFBAU Principle |
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Match the following:
1. A → (iv), B → (iii) C → (i), D → (ii)
2. A → (i), B → (iii) C → (ii), D → (iv)
3. A → (iv), B → (ii) C → (iii), D → (iv)
4. A → (i), B → (ii) C → (iii), D → (iv)
| (A) | Lyman | (i) | IR |
| (B) | Balmer | (ii) | IR |
| (C) | Paschen | (iii) | Visible |
| (D) | Pfund | (iv) | UV |
1. A → (iv), B → (iii) C → (i), D → (ii)
2. A → (i), B → (iii) C → (ii), D → (iv)
3. A → (iv), B → (ii) C → (iii), D → (iv)
4. A → (i), B → (ii) C → (iii), D → (iv)
Subtopic: Hydrogen Spectra |
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Choose the group that does not contain isotopes of the same element:
| Number of protons | Number of neutrons | ||
| 1. | Atom I | 18 | 18 |
| Atom II | 18 | 19 | |
| 2. | Atom I | 25 | 30 |
| Atom II | 25 | 31 | |
| 3. | Atom I | 37 | 42 |
| Atom II | 37 | 41 | |
| 4. | Atom I | 82 | 126 |
| Atom II | 81 | 126 |
Subtopic: Number of Electron, Proton & Neutron |
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The principle that describes our inability to precisely determine both the position and momentum of a subatomic particle simultaneously is known as:
1. Rydberg equation
2. Heisenberg uncertainty principle
3. Hund's rule
4. Pauli exclusion principle
Subtopic: Heisenberg Uncertainty Principle |
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Subtopic: Pauli's Exclusion Principle & Hund's Rule |
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Element X is found in two forms : 90.0% is an isotope that has a mass of 20.0 and 10.0% is an isotope that has a mass of 22.0. What is the atomic mass of element X?
1. 20.1
2. 20.2
3. 20.8
4. 21.2
1. 20.1
2. 20.2
3. 20.8
4. 21.2
Subtopic: Number of Electron, Proton & Neutron |
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The energy required to break a chemical bond is 3.313 × 10⁻¹² erg. Calculate the wavelength of the radiation (in cm) that can break this bond.
[Given: Speed of light, c = 3.00 × 10¹⁰ cm s⁻¹; Planck’s constant, h = 6.626 × 10⁻²⁷ erg s]
2. \(1.00 \times 10^{-5}\mathrm {cm}\)
3. \(2.00 \times 10^{-5} \mathrm {cm}\)
4. \(6.00 \times 10^{-5}\mathrm {cm}\)
Subtopic: Planck's Theory |
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Determine the identity of a species if it has 16 protons, 18 electrons, and 16 neutrons:
| 1. | \(S^{-}\) | 2. | \(Si^{2+}\) |
| 3. | \(P^{3-}\) | 4. | \(\mathrm{S}^{2-}\) |
Subtopic: Number of Electron, Proton & Neutron |
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Which of the following electronic configurations for ground state atoms is incorrect?
| 1. |  |
| 2. |  |
| 3. |  |
| 4. |  |
Subtopic: Shell & Subshell |
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