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Chemical Bonding and Molecular Structure · Question 76

AIPMT 2009MCQEasy📈 Topic in 12% papers+4−1
1

What is the dominant intermolecular force or bond that must be overcome in converting liquid CH3OH to a gas?

  1. Dipole-dipole interaction
  2. Covalent bonds
  3. London dispersion force
  4. Hydrogen bonding

Answer

(4) Hydrogen bonding

Solution

On vaporisation only the intermolecular forces are overcome; covalent bonds within the molecule are not broken.

CH3OH has an O–H group, so its molecules are linked by intermolecular hydrogen bonds (O-H O).

∵ Hydrogen bonding is much stronger than dipole-dipole and London forces in methanol,

∴ it is the dominant force to be overcome.

Answer: (4)

AIPMT 2009

Keep practising — Chemical Bonding and Molecular Structure

2

According to MO theory which of the lists ranks the nitrogen species in terms of increasing bond order ?

  1. N22- < N2- < N2
  2. N2 < N22- < N2-
  3. N2- < N22- < N2
  4. N2- < N2 < N22-
AIPMT 2009
3

In which of the following molecules/ions BF3, NO2-, NH2- and H2O, the central atom is sp2 hybridised?

  1. NH2- and H2O
  2. NO2- and H2O
  3. BF3 and NO2-
  4. NO2- and NH2-
AIPMT 2009
4

The energy absorbed by each molecule (A2) of a substance is 4.4 10-19 J and bond energy per molecule is 4.0 10-19 J. The kinetic energy of the molecule per atom will be

  1. 2.2 10-19 J
  2. 2.0 10-19 J
  3. 4.0 10-20 J
  4. 2.0 10-20 J
Out of syllabusAIPMT 2009
5

In the case of alkali metals, the covalent character decreases in the order

  1. MF > MCl > MBr > MI
  2. MF > MCl > MI > MBr
  3. MI > MBr > MCl > MF
  4. MCl > MI > MBr > MF
Out of syllabusAIPMT 2009
6

Four diatomic species are listed below. Identify the correct order in which the bond order is increasing in them

  1. NO < O2- < C22- < He2+
  2. O2- < NO < C22- < He2+
  3. C22- < He2+ < O2- < NO
  4. He2+ < O2- < NO < C22-
AIPMT 2008
7

The correct order of increasing bond angles in the following triatomic species is

  1. NO2+ < NO2 < NO2-
  2. NO2+ < NO2- < NO2
  3. NO2- < NO2+ < NO2
  4. NO2- < NO2 < NO2+
AIPMT 2008
8

The angular shape of ozone molecule (O3) consists of

  1. 1σ and 1π bond
  2. 2σ and 1π bond
  3. 1σ and 2π bonds
  4. 2σ and 2π bonds
AIPMT 2008
9

In which of the following pairs, the two species are isostructural?

  1. SO32- and NO3-
  2. BF3 and NF3
  3. BrO3- and XeO3
  4. SF4 and XeF4
AIPMT 2007
10

The correct order of C-O bond length among CO, CO32-, CO2 is

  1. CO < CO32- < CO2
  2. CO32- < CO2 < CO
  3. CO < CO2 < CO32-
  4. CO2 < CO32- < CO
AIPMT 2007
11

Which of the following is not a correct statement?

  1. Multiple bonds are always shorter than corresponding single bonds.
  2. The electron-deficient molecules can act as Lewis acids.
  3. The canonical structures have no real existence.
  4. Every AB5 molecule does in fact have square pyramid structure.
AIPMT 2006

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