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Chemical Bonding and Molecular Structure · Question 19

NEET (UG) 2022MCQMedium📈 Topic in 62% papers+4−1
1

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

Answer

(4) O2+ ion is diamagnetic

Solution

(1) Bond order = 12(Nb - Na): O2+ (15 e⁻) = 2.5, O2 (16 e⁻) = 2, O2- (17 e⁻) = 1.5, O22- (18 e⁻) = 1. Correct.

(2) C2 (12 e⁻): 1s2 *1s2 2s2 *2s2 ( 2px2 = 2py2) ⇒ 4 electrons in the two degenerate MOs. Correct.

(3) H2+ has 2 - 1 = 1 electron. Correct.

(4) O2+ (15 e⁻): ... ( 2px2 = 2py2) ( *2px1) ⇒ one unpaired electron, so it is paramagnetic. Incorrect.

Answer: (4)

NEET (UG) 2022

Keep practising — Chemical Bonding and Molecular Structure

2

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)
3

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)
4

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
5

Match 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)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
  3. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
  4. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
NEET (UG) 2021
6

Which of the following molecules is non-polar in nature?

  1. NO2
  2. POCl3
  3. CH2O
  4. SbCl5
NEET (UG) 2021
7

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
NEET (UG) 2020
8

Identify a molecule which does not exist.

  1. Li2
  2. C2
  3. O2
  4. He2
NEET (UG) 2020
9

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
10

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
11

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

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