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Chemical Bonding and Molecular Structure · Question 27

NEET (UG) 2019MCQMedium📈 Topic in 62% papers+4−1
1

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

  1. C2
  2. Be2
  3. O2
  4. N2

Answer

(1) C2

Solution

C2 (12 electrons): 1s2 *1s2 2s2 *2s2 ( 2px2 = 2py2)

Bond order = 8 - 42 = 2, and both bonds come from the two π molecular orbitals ( 2pz is empty).

As per NCERT, the double bond in C2 consists of both π bonds.

N2 and O2 have one σ and π bonds; Be2 has bond order 0.

Answer: (1)

NEET (UG) 2019

Keep practising — Chemical Bonding and Molecular Structure

2

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
3

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
4

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
5

The species, having bond angles of 120 is

  1. ClF3
  2. NCl3
  3. BCl3
  4. PH3
NEET 2017
6

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
7

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)
8

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)
9

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)
10

The hybridizations of atomic orbitals of nitrogen in NO2+, NO3- and NH4+ respectively are

  1. sp, sp3 and sp2
  2. sp2, sp3 and sp
  3. sp, sp2 and sp3
  4. sp2, sp and sp3
NEET 2016 (Phase 2)
11

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

  1. CO32-, NO3-
  2. ClO3-, CO32-
  3. SO32-, NO3-
  4. ClO3-, SO32-
NEET 2016 (Phase 2)

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