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Q. No.
Assertion (A):
Sigma (\(\sigma\)) bond is strong, while pi (\(\pi\)) bond is weak.
Reason (R):
Atoms rotate freely about pi (\(\pi\)) bond.
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: Types of Chemical Bond |
71%
Level 2: 60%+
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Subtopic: Acidic, Basic Character & Fajan's Rule |
62%
Level 2: 60%+
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If an extra electron is added to the hypothetical molecule C2, this extra electron will occupy the molecular orbital:
1. \(\pi_{2p}\)*
2. \(\pi_{2p}\)
3. \(\sigma_{2p}\)*
4. \(\sigma_{2p}\)
1. \(\pi_{2p}\)*
2. \(\pi_{2p}\)
3. \(\sigma_{2p}\)*
4. \(\sigma_{2p}\)
Subtopic: M.O.T |
55%
Level 3: 35%-60%
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Match List-I with List-II and mark the appropriate option.
| List-I (Types of bond) |
List-II (Molecules) |
||
| A. | Ionic | I. | NH3.BF3 |
| B. | Covalent | II. | HCl |
| C. | Hydrogen bond | III. | LiF |
| D. | Coordinate bond | IV. | HF |
| A | B | C | D | |
| 1 | II | III | IV | I |
| 2 | III | II | I | IV |
| 3 | III | II | IV | I |
| 4 | II | III | I | IV |
Subtopic: van der Waal Force & Hydrogen Bonding | Resonance & Nature of Compounds |
62%
Level 2: 60%+
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%+
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 |
68%
Level 2: 60%+
NEET - 2022
Hints
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 |
83%
Level 1: 80%+
NEET - 2022
Hints
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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Non-polar molecule among the following is/are:
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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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 |
81%
Level 1: 80%+
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