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Chemical Bonding and Molecular Structure

AIPMT 2010 (Prelims)MCQHard📈 Topic in 75% papers+4−1
Ques. 1AIPMT 2010 (Prelims)

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

  1. Cl2O < ClO2 < ClO2-
  2. ClO2 < Cl2O < ClO2-
  3. Cl2O < ClO2- < ClO2
  4. ClO2- < Cl2O < ClO2

Answer

(4) ClO2- < Cl2O < ClO2

Solution

ClO2-: Cl has 2 bond pairs + 2 lone pairs (sp3); two lone pairs compress the angle about 110°.

Cl2O: O has 2 bond pairs + 2 lone pairs (sp3), but the two large Cl atoms repel each other angle opens to about 111°, slightly more than in ClO2-.

ClO2: Cl has 2 bond pairs, 1 lone pair and 1 odd electron; an odd electron repels much less than a lone pair, and Cl–O bonds have partial double bond character about 118°.

Increasing bond angle: ClO2- < Cl2O < ClO2

Answer: (4)

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Ques. 2AIPMT 2009

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
Ques. 3AIPMT 2009

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-
Ques. 4AIPMT 2009

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-
Ques. 5AIPMT 2009

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 syllabus
Ques. 6AIPMT 2009

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 syllabus
Ques. 7AIPMT 2008

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-
Ques. 8AIPMT 2008

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+
Ques. 9AIPMT 2008

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
Ques. 10AIPMT 2007

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
Ques. 11AIPMT 2007

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

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