Chemical Bonding and Molecular Structure

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+

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

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-

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+]

Bond order of 1.5 is shown by

1. O2+
2. O2-
3. O22-
4. O2

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

The pair of species with the same bond order is

1. O22-, B2
2. O2+, NO+
3. NO, CO
4. N2, O2

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

1. [figure]
2. [figure]
3. [figure]
4. [figure]

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

Which of the following has the minimum bond length ?

1. O2+
2. O2-
3. O22-
4. O2