Which of the following is responsible to rule out the existence of definite paths or trajectories of electrons?
1. Pauli's exclusion principle
2. Heisenberg's uncertainty principle
3. Hund's rule of maximum multiplicity
4. Aufbau principle
Total number of orbitals associated with third shell will be _____.
1. 2
2. 4
3. 9
4. 3
Orbital angular momentum depends on _______.
1. l
2. n and l
3. n and
4. and
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
The pair of ions having the same electronic configuration is -
1. Cr3+, Fe3+
2. Fe3+, Mn2+
3. Fe3+, Co3+
4. Sc3+, Cr3+
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 |