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Chemical Bonding and Molecular Structure · Question 92

AIPMT 2005MCQMedium📈 Topic in 25% papers+4−1
1

The correct order in which the O-O bond length increases in the following is

  1. O2 < H2O2 < O3
  2. O3 < H2O2 < O2
  3. H2O2 < O2 < O3
  4. O2 < O3 < H2O2

Answer

(4) O2 < O3 < H2O2

Solution

As per NCERT, bond length decreases as bond order increases.

O2 (O=O): bond order = 2

O3: two resonance structures ⇒ bond order = 1.5

H2O2 (H–O–O–H): bond order = 1

⇒ O–O bond length: O2 (121 pm) < O3 (128 pm) < H2O2 (148 pm)

∴ Correct order: O2 < O3 < H2O2

Answer: (4)

AIPMT 2005

Keep practising — Chemical Bonding and Molecular Structure

2

The correct sequence of increasing covalent character is represented by

  1. LiCl < NaCl < BeCl2
  2. BeCl2 < LiCl < NaCl
  3. NaCl < LiCl < BeCl2
  4. BeCl2 < NaCl < LiCl
AIPMT 2005
3

Which of the following would have a permanent dipole moment?

  1. SiF4
  2. SF4
  3. XeF4
  4. BF3
AIPMT 2005
4

Among the following, the pair in which the two species are not isostructural is

  1. SiF4 and SF4
  2. IO3- and XeO3
  3. BH4- and NH4+
  4. PF6- and SF6
AIPMT 2004
5

In a regular octahedral molecule, MX6, the number of X - M - X bonds at 180 is

  1. three
  2. two
  3. six
  4. four
AIPMT 2004
6

H2O is dipolar, whereas BeF2 is not. It is because

  1. the electronegativity of F is greater than that of O
  2. H2O involves hydrogen bonding whereas BeF2 is a discrete molecule
  3. H2O is linear and BeF2 is angular
  4. H2O is angular and BeF2 is linear.
AIPMT 2004
7

In BrF3 molecule, the lone pairs occupy equatorial positions to minimize

  1. lone pair - bond pair repulsion only
  2. bond pair - bond pair repulsion only
  3. lone pair - lone pair repulsion and lone pair - bond pair repulsion
  4. lone pair - lone pair repulsion only.
AIPMT 2004
8

Which one of the following statements is not correct for sigma- and pi- bonds formed between two carbon atoms?

  1. sigma-bond is stronger than a pi-bond.
  2. Bond energies of sigma- and pi-bonds are of the order of 264 kJ/mol and 347 kJ/mol, respectively
  3. Free rotation of atoms about a sigma-bond is allowed but not in case of a pi-bond.
  4. Sigma-bond determines the direction between carbon atoms but a pi-bond has no primary effect in this regard.
AIPMT 2003
9

Which of the following has p - d bonding?

  1. NO3-
  2. SO32-
  3. BO33-
  4. CO32-
AIPMT 2002
10

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
AIPMT 2002
11

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

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