- 1(current)
Q. No.| Assertion (A): | Helium and berylium having the similar outer electronic configuration of type \(ns^2\). |
| Reason (R): | Both are chemically inert. |
| 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. | Both (A) and (R) are False. |
Subtopic: AUFBAU Principle |
68%
Level 2: 60%+
Hints
Match the following rules with their statements:
| Rules: | Statements: | ||
| A. | Hund’s Rule | (i) | No two electrons in an atom can have the same set of four quantum numbers. |
| B. | Aufbau Principle | (ii) | In the ground state of atoms, orbitals are filled in the order of their increasing energies. |
| C. | Pauli Exclusion Principle | (iii) | 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 | (iv) | It is impossible to determine the exact position and exact momentum of a subatomic particle simultaneously. |
Correct option is:
1. A-(i),B-(ii),C-(iii),D-(iv)
2. A-(i),B-(iii),C-(ii),D-(iv)
3. A-(iii),B-(ii),C-(i),D-(iv)
4. A-(iii),B-(i),C-(ii),D-(iv)
Subtopic: Pauli's Exclusion Principle & Hund's Rule | AUFBAU Principle |
82%
Level 1: 80%+
Hints
- 1(current)
Q. No.
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