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Q. No.Consider the following five chemical species:
NH₃, AlCl₃, BeCl₂, CCl₄ and PCl₅
How many of these species violate the octet rule by having either fewer or more than
eight electrons in the valence shell of their central atom?
| 1. | One | 2. | Three |
| 3. | Two | 4. | Four |
Subtopic: Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
62%
Level 2: 60%+
NEET - 2023
Hints
Which of the following pairs of ions are isoelectronic and isostructural?
| 1. | \(\mathrm{CO}_3^{2-}, \mathrm{SO}_3^{2-} \) | 2. | \(\mathrm{ClO}_3^{-}, \mathrm{CO}_3^{2-} \) |
| 3. | \(\mathrm{SO}_3^{2-}, \mathrm{NO}_3^{-} \) | 4. | \(\mathrm{ClO}_3^{-}, \mathrm{SO}_3^{2-}\) |
Subtopic: Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
72%
Level 2: 60%+
NEET - 2015
Hints
Subtopic: Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
79%
Level 2: 60%+
AIPMT - 2013
Hints
Subtopic: Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
76%
Level 2: 60%+
AIPMT - 2013
Hints
Match Column I (Molecule) with Column II (Bond enthalpy) and mark the correct option:
| Column-I (Molecule) |
Column-II (Bond enthalpy) \(\left(k J \mathrm{~mol}^{-1}\right)\) |
||
| A. | HCl | I. | 435.8 |
| B. | \(\mathrm{N_2}\) | II. | 498 |
| C. | \(\mathrm{H_2}\) | III. | 946.0 |
| D. | \(\mathrm{O_2}\) | IV. | 431.0 |
| 1. | A-III, B-IV, C-I, D-II | 2. | A-IV, B-I, C-III, D-II |
| 3. | A-IV, B-III, C-II, D-I | 4. | A-IV, B-III, C-I, D-II |
Subtopic: Types of Chemical Bond |
66%
Level 2: 60%+
NEET - 2024
Hints
Subtopic: Types of Chemical Bond |
79%
Level 2: 60%+
NEET - 2015
Hints
Dipole-induced dipole interactions are present in which of the following pairs?
1. Cl2 and CCl4
2. HCl and He atoms
3. SiF4 and He atoms
4. H2O and Alcohol
1. Cl2 and CCl4
2. HCl and He atoms
3. SiF4 and He atoms
4. H2O and Alcohol
Subtopic: Types of Chemical Bond |
60%
Level 2: 60%+
AIPMT - 2013
Hints
The potential energy (y) curve for H2 formation as a function of internuclear distance (x) of the H atoms is shown below.
The bond energy of H2 is:
| 1. | (b – a) | 2. | \(\dfrac{\left(\right. c - a \left.\right)}{2}\) |
| 3. | \(\dfrac{\left(\right. b - a \left.\right)}{2}\) | 4. | (c – a) |
Subtopic: Covalent Bond |
54%
Level 3: 35%-60%
NEET - 2020
Hints
Which one of the following statements is true about the structure of \(\mathrm{CO^{2-}_3}\) ion?
| 1. | It can be explained by considering sp3 hybridization. |
| 2. | Out of the three C–O bonds, two are longer and one is shorter. |
| 3. | It has three sigma and three \(\pi\)-bonds. |
| 4. | All three C–O bonds are equal in length with a bond order in between 1 and 2. |
Subtopic: Resonance & Nature of Compounds |
55%
Level 3: 35%-60%
NEET - 2022
Hints
Which one of the following statements is correct?
| 1. | BF3 has non-zero dipole moment. |
| 2. | The dipole moment of NF3 is greater than that of NH3. |
| 3. | Three canonical forms can be drawn for \(\text{CO}_3^{2-}\) ion. |
| 4. | Three resonance structures can be drawn for ozone. |
Subtopic: Polarity | Resonance & Nature of Compounds |
58%
Level 3: 35%-60%
NEET - 2024
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