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Chemical Bonding and Molecular Structure · Question 25

NEET (UG) 2020MCQEasy📈 Topic in 12% papers+4−1
1

Which of the following set of molecules will have zero dipole moment?

  1. Boron trifluoride, hydrogen fluoride, carbon dioxide, 1, 3-dichlorobenzene
  2. Nitrogen trifluoride, beryllium difluoride, water, 1, 3-dichlorobenzene
  3. Boron trifluoride, beryllium difluoride, carbon dioxide, 1, 4-dichlorobenzene
  4. Ammonia, beryllium difluoride, water, 1, 4-dichlorobenzene

Answer

(3) Boron trifluoride, beryllium difluoride, carbon dioxide, 1, 4-dichlorobenzene

Solution

BF3: trigonal planar ⇒ bond dipoles cancel ⇒ = 0

BeF2 and CO2: linear ⇒ = 0

1,4-Dichlorobenzene: the two C-Cl dipoles are opposite (180°) ⇒ = 0

HF, NF3, NH3, H2O and 1,3-dichlorobenzene have 0.

∴ Set (C) has zero dipole moment.

Answer: (3)

NEET (UG) 2020

Keep practising — Chemical Bonding and Molecular Structure

2

Identify a molecule which does not exist.

  1. Li2
  2. C2
  3. O2
  4. He2
NEET (UG) 2020
3

Which of the following diatomic molecular species has only bonds according to Molecular Orbital Theory?

  1. C2
  2. Be2
  3. O2
  4. N2
NEET (UG) 2019
4

Consider the following species : CN+, CN-, NO and CN. Which one of these will have the highest bond order?

  1. NO
  2. CN-
  3. CN+
  4. CN
NEET 2018
5

In the structure of ClF3, the number of lone pairs of electrons on central atom ‘Cl’ is

  1. one
  2. two
  3. four
  4. three
NEET 2018
6

Which of the following pairs of compounds is isoelectronic and isostructural ?

  1. TeI2, XeF2
  2. IBr2-, XeF2
  3. IF3, XeF2
  4. BeCl2, XeF2
NEET 2017
7

The species, having bond angles of 120 is

  1. ClF3
  2. NCl3
  3. BCl3
  4. PH3
NEET 2017
8

Which one of the following pairs of species have the same bond order ?

  1. O2, NO+
  2. CN-, CO
  3. N2, O2-
  4. CO, NO
NEET 2017
9

Consider the molecules CH4, NH3 and H2O. Which of the given statements is false?

  1. The H-O-H bond angle in H2O is smaller than the H-N-H bond angle in NH3.
  2. The H-C-H bond angle in CH4 is larger than the H-N-H bond angle in NH3.
  3. The H-C-H bond angle in CH4, the H-N-H bond angle in NH3, and the H-O-H bond angle in H2O are all greater than 90 .
  4. The H-O-H bond angle in H2O is larger than the H-C-H bond angle in CH4.
NEET 2016 (Phase 1)
10

Predict the correct order among the following :

  1. bond pair - bond pair > lone pair - bond pair > lone pair - lone pair
  2. lone pair - bond pair > bond pair - bond pair > lone pair - lone pair
  3. lone pair - lone pair > lone pair - bond pair > bond pair - bond pair
  4. lone pair - lone pair > bond pair - bond pair > lone pair - bond pair
NEET 2016 (Phase 1)
11

Which one of the following compounds shows the presence of intramolecular hydrogen bond?

  1. H2O2
  2. HCN
  3. Cellulose
  4. Concentrated acetic acid
NEET 2016 (Phase 2)

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