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Chemical Bonding and Molecular Structure · Question 20

JEE Main 2026 (Online) 22nd January Evening ShiftMCQEasy📈 Topic in 6% papers+4−1
1

Among H2S, H2O, NF3, NH3 and CHCl3, identify the molecule (X) with lowest dipole moment value. The number of lone pairs of electrons present on the central atom of the molecule (X) is :

  1. 3
  2. 2
  3. 0
  4. 1

Answer

(4) 1

Solution

Dipole moments (in D): H2O (1.85) > NH3 (1.47) > CHCl3 (1.04) > H2S (0.95) > NF3 (0.23)

As per NCERT, in NH3 the orbital dipole of the lone pair on N is in the same direction as the resultant of the N–H bond dipoles, whereas in NF3 it is opposite to the resultant of the N–F bond dipoles (F is more electronegative than N), so the moments largely cancel.

X = NF3 (lowest dipole moment).

In NF3, N has 5 valence electrons; 3 are used in the three N–F bonds 1 lone pair on N (pyramidal shape).

Answer: (4)

JEE Main 2026 (Online) 22nd January Evening Shift

Keep practising — Chemical Bonding and Molecular Structure

2

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below:

  1. Both Statement I and Statement II are true
  2. Statement I is true but Statement II is false
  3. Statement I is false but Statement II is true
  4. Both Statement I and Statement II are false
JEE Main 2026 (Online) 21st January Morning Shift
3

The correct increasing order of C-H(A), C-O(B), C=O(C) and C N(D) bonds in terms of covalent bond length is :

  1. D < C < B < A
  2. D < C < A < B
  3. A < B < C < D
  4. A < D < C < B
JEE Main 2026 (Online) 21st January Evening Shift
4

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

  1. A-IV, B-III, C-II, D-I
  2. A-III, B-IV, C-I, D-II
  3. A-II, B-I, C-IV, D-III
  4. A-III, B-IV, C-II, D-I
JEE Main 2025 (Online) 7th April Morning Shift
5

In SO2, NO2- and N3-, the hybridizations at the central atom are respectively :

  1. sp2, sp2 and sp2
  2. sp, sp2 and sp
  3. sp2, sp and sp
  4. sp2, sp2 and sp
JEE Main 2025 (Online) 7th April Evening Shift
6

Which of the following molecule(s) show/s paramagnetic behavior? Choose the correct answer from the options given below:

  1. A & C only
  2. A & E Only
  3. A & D Only
  4. B Only
JEE Main 2025 (Online) 4th April Morning Shift
7

Given below are two statements: In the light of the above statements, choose the most appropriate answer from the options given below:

  1. Both Statement I and Statement II are correct
  2. Both Statement I and Statement II are incorrect
  3. Statement I is correct but Statement II is incorrect
  4. Statement I is incorrect but Statement II is correct
JEE Main 2025 (Online) 4th April Evening Shift
8

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

  1. A-IV, B-I, C-II, D-III
  2. A-III, B-I, C-IV, D-II
  3. A-II, B-III, C-IV, D-I
  4. A-I, B-II, C-III, D-IV
JEE Main 2025 (Online) 3rd April Morning Shift
9

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below

  1. Both Statement I and Statement II are false
  2. Both Statement I and Statement II are true
  3. Statement I is false but Statement II is true
  4. Statement I is true but Statement II is false
JEE Main 2025 (Online) 3rd April Evening Shift
10

A molecule with the formula AX4Y has all its elements from p-block. Element A is rarest, monoatomic, non-radioactive from its group and has the lowest ionization enthalpy value among A, X and Y. Elements X and Y have first and second highest electronegativity values respectively among all the known elements. The shape of the molecule is:

  1. Pentagonal planar
  2. Square pyramidal
  3. Trigonal bipyramidal
  4. Octahedral
JEE Main 2025 (Online) 2nd April Morning Shift
11

Among SO2, NF3, NH3, XeF2, ClF3 and SF4, the hybridization of the molecule with nonzero dipole moment and highest number of lone-pairs of electrons on the central atom is

  1. sp3
  2. dsp2
  3. sp3d2
  4. sp3d
JEE Main 2025 (Online) 2nd April Morning Shift

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