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Chemical Bonding and Molecular Structure · Question 55

NEET 2013 (Karnataka)MCQMedium📈 Topic in 62% papers+4−1
1

In which of the following ionization processes the bond energy increases and the magnetic behaviour changes from paramagnetic to diamagnetic.

  1. O2 O2+
  2. C2 C2+
  3. NO NO+
  4. N2 N2+

Answer

(3) NO NO+

Solution

NO (15 electrons): one unpaired electron in *2p ⇒ paramagnetic, bond order 2.5

NO+ (14 electrons): all electrons paired ⇒ diamagnetic, bond order 3

⇒ Bond order (and bond energy) increases and the species becomes diamagnetic.

O2 O2+: bond order rises but O2+ is still paramagnetic.

C2 C2+ and N2 N2+: bond order falls and the product becomes paramagnetic.

Answer: (3)

NEET 2013 (Karnataka)

Keep practising — Chemical Bonding and Molecular Structure

2

During change of O2 to O2- ion, the electron adds on which one of the following orbitals ?

  1. * orbital
  2. orbital
  3. * orbital
  4. orbital
AIPMT 2012 (Mains)
3

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 2012 (Mains)
4

Which one of the following pairs is isostructural (i.e., having the same shape and hybridization) ?

  1. [BCl3 and BrCl3]
  2. [NH3 and NO3-]
  3. [NF3 and BF3]
  4. [BF4- and NH4+]
AIPMT 2012 (Prelims)
5

Bond order of 1.5 is shown by

  1. O2+
  2. O2-
  3. O22-
  4. O2
AIPMT 2012 (Prelims)
6

Which of the following species contains three bond pairs and one lone pair around the central atom ?

  1. H2O
  2. BF3
  3. NH2-
  4. PCl3
AIPMT 2012 (Prelims)
7

The pair of species with the same bond order is

  1. O22-, B2
  2. O2+, NO+
  3. NO, CO
  4. N2, O2
AIPMT 2012 (Prelims)
8

Which of the following structures is the most preferred and hence of lowest energy for SO3?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2011 (Mains)
9

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

  1. O2-, O22- – Both diamagnetic
  2. O2+, O2 – Both paramagnetic
  3. O, O22- – Both paramagnetic
  4. O+, O22- – Both paramagnetic
AIPMT 2011 (Mains)
10

Which of the following has the minimum bond length ?

  1. O2+
  2. O2-
  3. O22-
  4. O2
AIPMT 2011 (Prelims)
11

Which of the two ions from the list given below that have the geometry that is explained by the same hybridization of orbitals, NO2-, NO3-, NH2-, NH4+, SCN-?

  1. NO2- and NO3-
  2. NH4+ and NO3-
  3. SCN- and NH2-
  4. NO2- and NH2-
AIPMT 2011 (Prelims)

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