Chemical Bonding and Molecular Structure

Which of the following is paramagnetic?

1. CN-
2. NO+
3. CO
4. O2-

Which one of the following molecules contains no bond?

1. SO2
2. NO2
3. CO2
4. H2O

The pair of species that has the same bond order in the following is

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

In which of the following pair both the species have sp3 hybridization ?

1. SiF4, BeH2
2. NF3, H2O
3. NF3, BF3
4. H2S, BF3

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