Chemical Bonding and Molecular Structure

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-

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

1. Be2+
2. Be2
3. B2
4. Li2

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

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

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

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-

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-

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

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

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-