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Chemical Bonding and Molecular Structure · Question 97

AIPMT 2004MCQEasy📈 Topic in 12% papers+4−1
1

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.

Answer

(4) H2O is angular and BeF2 is linear.

Solution

The dipole moment of a molecule is the vector sum of its bond dipoles, so it depends on the shape.

H2O: O has 2 bond pairs + 2 lone pairs ⇒ bent (angular) shape, bond angle 104.5 ⇒ the two O–H bond dipoles do not cancel ⇒ = 1.85 D (polar).

BeF2: Be has 2 bond pairs, no lone pair ⇒ linear (F–Be–F = 180 ) ⇒ the two equal Be–F bond dipoles cancel ⇒ = 0.

∴ H2O is dipolar because it is angular, while BeF2 is linear.

Answer: (4)

AIPMT 2004

Keep practising — Chemical Bonding and Molecular Structure

2

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
3

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
4

Which of the following has p - d bonding?

  1. NO3-
  2. SO32-
  3. BO33-
  4. CO32-
AIPMT 2002
5

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
6

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
7

Which of the following two are isostructural?

  1. XeF2, IF2-
  2. NH3, BF3
  3. CO32-, SO32-
  4. PCl5, ICl5
AIPMT 2001
8

In which of the following bond angle is maximum ?

  1. NH3
  2. NH4+
  3. PCl3
  4. SCl2
AIPMT 2001
9

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
10

d - p bond present in

  1. CO32-
  2. PO43-
  3. NO3-
  4. NO2-
AIPMT 2000
11

Right order of dissociation energy N2 and N2+ is

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

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