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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
eight electrons in the valence shell of their central atom?
Subtopic: Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
62%
Level 2: 60%+
NEET - 2023
Hints
The sum of the number of lone pairs in a central atom in \(IF_5 \) and \(IF_7 \) is:
1. 2
2. 0
3. 1
4. 3
1. 2
2. 0
3. 1
4. 3
Subtopic: V.S.E.P.R & V.B.T |
87%
Level 1: 80%+
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Which one of the following statements is incorrect related to Molecular Orbital Theory?
| 1. | The \(\pi^*\) antibonding molecular orbital has a node between the nuclei. |
| 2. | In the formation of a bonding molecular orbital, the two electron waves of the bonding atoms reinforce each other. |
| 3. | Molecular orbitals obtained from \(2P_x\) and \(2P_y\) orbitals are symmetrical around the bond axis. |
| 4. | A \(\pi-\)bonding molecular orbital has larger electron density above and below the internuclear axis. |
Subtopic: M.O.T |
52%
Level 3: 35%-60%
NEET - 2023
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What is the formal charge on the central nitrogen in the Lewis structure of N2O?
| 1. | 0 |
| 2. | +1 |
| 3. | -1 |
| 4. | 0 in some resonance structures, –1 in other resonance structures |
Subtopic: Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
58%
Level 3: 35%-60%
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Which compound among the following represents an expanded octet?
1. \(\text{BeH}_2 \)
2. \(\text{LiCl}\)
3. \(\text{H}_2\text{SO}_4 \)
4. \(\text{NO} \)
1. \(\text{BeH}_2 \)
2. \(\text{LiCl}\)
3. \(\text{H}_2\text{SO}_4 \)
4. \(\text{NO} \)
Subtopic: Resonance & Nature of Compounds |
82%
Level 1: 80%+
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How many molecules among the following are non-polar in nature?
1. (a) and (d) only
2. (a), (b), (c) and (d)
3. (a), (b) and (d) only
4. (b) and (d) only
| a. |  |
b. |  |
| c. |  |
d. |  |
1. (a) and (d) only
2. (a), (b), (c) and (d)
3. (a), (b) and (d) only
4. (b) and (d) only
Subtopic: Polarity |
69%
Level 2: 60%+
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Repulsive interaction of electron pairs follow the order:
| 1. | LP-LP > BP-BP > LP-BP |
| 2. | LP-BP > BP-BP > LP-LP |
| 3. | LP-LP > LP-BP > BP-BP |
| 4. | BP-BP > LP-BP > LP-LP |
Subtopic: V.S.E.P.R & V.B.T |
95%
Level 1: 80%+
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Match molecules in List-I with the Corresponding shape in List-II:
Choose the correct answer from the options given below:
| List-I (Molecules) |
List-II (Shape) |
||
| (a) | NH3 | (i) | Square pyramidal |
| (b) | ClF3 | (ii) | Trigonal bipyramidal |
| (c) | PCl5 | (iii) | Trigonal pyramidal |
| (d) | BrF5 | (iv) | T-shape |
| (a) | (b) | (c) | (d) | |
| 1. | (ii) | (iii) | (iv) | (i) |
| 2. | (iii) | (iv) | (ii) | (i) |
| 3. | (iv) | (iii) | (i) | (ii) |
| 4. | (iii) | (iv) | (i) | (ii) |
Subtopic: V.S.E.P.R & V.B.T |
82%
Level 1: 80%+
NEET - 2022
Hints
The correct order of bond angles in the following compounds/ species is:
| 1. | \(\mathrm{H}_2 \mathrm{O}<\mathrm{NH}_3<\mathrm{NH}_4^{+}<\mathrm{CO}_2 \) |
| 2. | \(\mathrm{H}_2 \mathrm{O}<\mathrm{NH}_4^{+}<\mathrm{NH}_3<\mathrm{CO}_2 \) |
| 3. | \(\mathrm{H}_2 \mathrm{O}<\mathrm{NH}_4^{+}=\mathrm{NH}_3<\mathrm{CO}_2 \) |
| 4. | \(\mathrm{CO}_2<\mathrm{NH}_3<\mathrm{H}_2 \mathrm{O}<\mathrm{NH}_4^{+} \) |
Subtopic: V.S.E.P.R & V.B.T |
67%
Level 2: 60%+
NEET - 2022
Hints
The molecules that have an overall permanent dipole moment among the following is/are:
(A) CO2
(B) H2O
(C) NH3
(A) CO2
(B) H2O
(C) NH3
| 1. | A and C only | 2. | C and B only |
| 3. | A, B, and C | 4. | None of these |
Subtopic: Polarity |
82%
Level 1: 80%+
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