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Chemical Bonding and Molecular Structure · Question 67

AIPMT 2011 (Prelims)MCQMedium📈 Topic in 62% papers+4−1
1

The pairs of species of oxygen and their magnetic behavior are noted below. Which of the following presents the correct description?

  1. O2-, O22- - Both diamagnetic
  2. O+, O22- - Both paramagnetic
  3. O2+, O2 - Both paramagnetic
  4. O, O22- - Both paramagnetic

Answer

(3) O2+, O2 - Both paramagnetic

Solution

Unpaired electrons:

O2: *2px1 *2py1 2 unpaired (paramagnetic)

O2+: *2px1 1 unpaired (paramagnetic)

O2-: 1 unpaired (paramagnetic); O22-: all paired (diamagnetic)

O atom (2p4): 2 unpaired; O+ (2p3): 3 unpaired (both paramagnetic)

Options (1), (2) and (4) fail because O2- is paramagnetic and O22- is diamagnetic; O2+ and O2 are both paramagnetic.

Answer: (3)

AIPMT 2011 (Prelims)

Keep practising — Chemical Bonding and Molecular Structure

2

Considering the state of hybridization of carbon atoms, find out the molecule among the following which is linear ?

  1. CH3-CH=CH-CH3
  2. CH3-C C-CH3
  3. CH2=CH-CH2-C CH
  4. CH3-CH2-CH2-CH3
AIPMT 2011 (Prelims)
3

Which of the following compounds has the lowest melting point?

  1. CaCl2
  2. CaBr2
  3. CaI2
  4. CaF2
Out of syllabusAIPMT 2011 (Prelims)
4

In which of the following molecules the central atom does not have sp3 hybridization?

  1. CH4
  2. SF4
  3. BF4-
  4. NH4+
AIPMT 2010 (Mains)
5

Some of the properties of the two species, NO3- and H3O+ are described below. Which one of them is correct?

  1. Dissimilar in hybridization for the central atom with different structures.
  2. Isostructural with same hybridization for the central atom.
  3. Isostructural with different hybridization for the central atom.
  4. Similar in hybridization for the central atom with different structures.
AIPMT 2010 (Mains)
6

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-
AIPMT 2010 (Prelims)
7

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

  1. Be2+
  2. Be2
  3. B2
  4. Li2
AIPMT 2010 (Prelims)
8

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)
9

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)
10

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
11

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

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