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Chemical Bonding and Molecular Structure · Question 12

NEET (UG) 2024MCQEasy📈 Topic in 25% papers+4−1
1

Identify the correct answer.

  1. Three resonance structures can be drawn for ozone
  2. BF3 has non-zero dipole moment
  3. Dipole moment of NF3 is greater than that of NH3
  4. Three canonical forms can be drawn for CO32- ion

Answer

(4) Three canonical forms can be drawn for CO32- ion

Solution

(1) Ozone has only two resonance structures — incorrect.

(2) BF3 is trigonal planar and symmetrical, so its dipole moment is zero — incorrect.

(3) In NH3 the bond moments and the lone-pair moment act in the same direction, while in NF3 they oppose each other; (NH3) = 1.47 D > (NF3) = 0.23 D — incorrect.

(4) CO32- has three equivalent canonical forms (the C=O double bond on each of the three O atoms) — correct.

Answer: (4)

NEET (UG) 2024

Keep practising — Chemical Bonding and Molecular Structure

2

Which of the following molecules has "NON ZERO" dipole moment value?

  1. CCl4
  2. HI
  3. CO2
  4. BF3
RE-NEET (UG) 2024
3

Identify the incorrect statement about PCl5.

  1. PCl5 possesses two different Cl-P-Cl bond angles
  2. All five P-Cl bonds are identical in length
  3. PCl5 exhibits sp3d hybridisation
  4. PCl5 consists of five P-Cl (sigma) bonds
RE-NEET (UG) 2024
4

Match List-I with List-II: Choose the correct answer from the options given below:

  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
RE-NEET (UG) 2024
5

Amongst the following, the total number of species NOT having eight electrons around central atom in its outermost shell, is NH3, AlCl3, BeCl2, CCl4, PCl5

  1. 2
  2. 4
  3. 1
  4. 3
NEET (UG) 2023
6

The correct order of energies of molecular orbitals of N2 molecule, is

  1. 1s < 1s < 2s < 2s < 2pz < ( 2px = 2py) < ( 2px = 2py) < 2pz
  2. 1s < 1s < 2s < 2s < 2pz < 2pz < ( 2px = 2py) < ( 2px = 2py)
  3. 1s < 1s < 2s < 2s < ( 2px = 2py) < ( 2px = 2py) < 2pz < 2pz
  4. 1s < 1s < 2s < 2s < ( 2px = 2py) < 2pz < ( 2px = 2py) < 2pz
NEET (UG) 2023
7

Amongst the following which one will have maximum 'lone pair - lone pair' electron repulsions?

  1. ClF3
  2. IF5
  3. SF4
  4. XeF2
NEET (UG) 2022
8

Which amongst the following is incorrect statement?

  1. The bond orders of O2+, O2, O2- and O22- are 2.5, 2, 1.5 and 1, respectively
  2. C2 molecule has four electrons in its two degenerate molecular orbitals
  3. H2+ ion has one electron
  4. O2+ ion is diamagnetic
NEET (UG) 2022
9

Match List-I with List-II : Choose the correct answer from the options given below :

  1. (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
  2. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
  3. (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
  4. (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
NEET (UG) 2022 (Phase 2)
10

The correct order of bond angles in the following compounds/species is :

  1. CO2 < NH3 < H2O < +NH4
  2. H2O < NH3 < +NH4 < CO2
  3. H2O < +NH4 < NH3 < CO2
  4. H2O < +NH4 = NH3 < CO2
NEET (UG) 2022 (Phase 2)
11

BF3 is planar and electron deficient compound. Hybridization and number of electrons around the central atom, respectively are :

  1. sp2 and 8
  2. sp3 and 4
  3. sp3 and 6
  4. sp2 and 6
NEET (UG) 2021

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