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Chemical Bonding and Molecular Structure · Question 72

AIPMT 2010 (Prelims)MCQEasy📈 Topic in 12% papers+4−1
1

In which of the following pairs of molecules/ ions, the central atoms have sp2 hybridisation ?

  1. NO2- and NH3
  2. BF3 and NO2-
  3. NH2- and H2O
  4. BF3 and NH2-

Answer

(2) BF3 and NO2-

Solution

Steric number = number of σ bonds + number of lone pairs on the central atom.

BF3: 3 σ bonds + 0 lone pair = 3 ⇒ sp2

NO2-: 2 σ bonds + 1 lone pair on N = 3 ⇒ sp2

NH3: 3 σ bonds + 1 lone pair = 4 ⇒ sp3

NH2- and H2O: 2 σ bonds + 2 lone pairs = 4 ⇒ sp3

∴ Both central atoms are sp2 in BF3 and NO2-.

Answer: (2)

AIPMT 2010 (Prelims)

Keep practising — Chemical Bonding and Molecular Structure

2

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

  1. Be2+
  2. Be2
  3. B2
  4. Li2
AIPMT 2010 (Prelims)
3

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)
4

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)
5

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
6

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
7

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
8

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
9

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
10

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
11

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

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