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Chemical Bonding and Molecular Structure · Question 73

AIPMT 2010 (Prelims)MCQEasy📈 Topic in 62% papers+4−1
1

Which one of the following species does not exist under normal conditions?

  1. Be2+
  2. Be2
  3. B2
  4. Li2

Answer

(2) Be2

Solution

Bond order = 12(Nb - Na)

Be2 (8 electrons): 1s2 * 1s2 2s2 * 2s2

⇒ Bond order = 12(4 - 4) = 0

As per NCERT, a zero bond order means Be2 molecule is unstable and does not exist.

Be2+ (B.O. = 0.5), B2 (B.O. = 1) and Li2 (B.O. = 1) have positive bond orders and can exist.

Answer: (2)

AIPMT 2010 (Prelims)

Keep practising — Chemical Bonding and Molecular Structure

2

In which one of the following species the central atom has the type of hybridization which is not the same as that present in the other three ?

  1. SF4
  2. I3-
  3. SbCl52-
  4. PCl5
AIPMT 2010 (Prelims)
3

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
AIPMT 2010 (Prelims)
4

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
AIPMT 2009
5

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
6

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
7

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
8

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
9

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
10

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
11

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

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