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Q. No.Subtopic: Hybridisation |
79%
Level 2: 60%+
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Given below are two statements:
In the light of the above statements, choose the most appropriate answer from the options given below:
| Assertion (A): | An atomic orbital is monocentric, whereas a molecular orbital is polycentric. |
| Reason (R): | An electron in an atomic orbital is influenced by one nucleus whereas in a molecular orbital, it is influenced by two or more nuclei depending upon the number of atoms in a molecule. |
In the light of the above statements, choose the most appropriate answer from the options given below:
| 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: M.O.T |
91%
Level 1: 80%+
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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 molecule is correctly matched with its shape as predicted by VSEPR theory?
| 1. | PCl3 | Trigonal pyramidal |
| 2. | OF2 | Linear |
| 3. | CIF3 | Trigonal planar |
| 4. | SF6 | Hexagonal |
Subtopic: V.S.E.P.R & V.B.T |
60%
Level 2: 60%+
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Which of the following molecules or ions have one or more lone pairs of valence electrons on their central atom?
| 1. | \(\mathrm{AlCl_4^-}\) | 2. | \(\mathrm{CO_2}\) |
| 3. | \(\mathrm{PCl_4^+}\) | 4. | \(\mathrm{SO_2}\) |
Subtopic: Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
80%
Level 1: 80%+
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Identify the species where the central atom strictly obeys the octet rule:
1. XeF4
2. SF4
3. SiF4
4. [ClF4]−
1. XeF4
2. SF4
3. SiF4
4. [ClF4]−
Subtopic: Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
78%
Level 2: 60%+
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Molecule that form H-bond is:
| 1. | \(\mathrm{NH}_3 \) | 2. | \(\mathrm{R}-\mathrm{CN} ~\) |
| 3. | \(\mathrm{R}-\mathrm{O}-\mathrm{R} ~\) | 4. | \(\mathrm{R}-\mathrm{Br} \) |
Subtopic: van der Waal Force & Hydrogen Bonding |
86%
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
Hints
The correct order of dipole moments for molecules \(NH_3, H_2S , CH_4 \) and \(HF\) is :
| 1. | \(CH_4>H_2S>NH_3>HF \) |
| 2. | \(H_2S>NH_3>HF>CH_4 \) |
| 3. | \(NH_3>HF>CH_4>H_2~S \) |
| 4. | \(HF>NH_3>H_2S>CH_4\) |
Subtopic: Polarity |
67%
Level 2: 60%+
NEET - 2023
Hints
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
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