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Chemical Bonding and Molecular Structure · Question 101

AIPMT 2002MCQMedium📈 Topic in 12% papers+4−1
1

In NO3- ion number of bond pair and lone pair of electrons on nitrogen atom are

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

Answer

(4) 4, 0

Solution

Lewis structure of NO3-: N forms one N=O double bond, one N-O single bond and one N O- bond (N is sp2).

⇒ Shared electron pairs around N = 2 + 1 + 1 = 4

⇒ Valence electrons of N used = 5 and N carries a formal charge of +1, so no electron is left as a lone pair.

∴ Bond pairs = 4, lone pairs = 0

Answer: (4)

AIPMT 2002

Keep practising — Chemical Bonding and Molecular Structure

2

Main axis of a diatomic molecule is z, atomic orbitals px and py overlap to form which of the following orbitals.

  1. molecular orbital
  2. molecular orbital
  3. molecular orbital
  4. No bond will form
AIPMT 2001
3

Which of the following two are isostructural?

  1. XeF2, IF2-
  2. NH3, BF3
  3. CO32-, SO32-
  4. PCl5, ICl5
AIPMT 2001
4

In which of the following bond angle is maximum ?

  1. NH3
  2. NH4+
  3. PCl3
  4. SCl2
AIPMT 2001
5

In X-H Y, X and Y both are electronegative elements. Then

  1. electron density on X will increase and on H will decrease
  2. in both electron density will increase
  3. in both electron density will decrease
  4. on X electron density will decrease and on H will increase.
AIPMT 2001
6

d - p bond present in

  1. CO32-
  2. PO43-
  3. NO3-
  4. NO2-
AIPMT 2000
7

Right order of dissociation energy N2 and N2+ is

  1. N2 > N2+
  2. N2 = N2+
  3. N2+ > N2
  4. none
AIPMT 2000
8

Which species does not exhibit paramagnetism?

  1. N2+
  2. O2-
  3. CO
  4. NO
AIPMT 2000
9

Which compound forms linear polymer due to H-bond?

  1. H2O
  2. NH3
  3. HF
  4. HCl
Out of syllabusAIPMT 2000

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