Chemical Bonding and Molecular Structure

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

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-

The correct order of increasing bond length of C-H, C-O, C-C and C=C is

1. C-H < C=C < C-O < C-C
2. C-C < C=C < C-O < C-H
3. C-O < C-H < C-C < C=C
4. C-H < C-O < C-C < C=C

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

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

Which of the following compounds has the lowest melting point?

1. CaCl2
2. CaBr2
3. CaI2
4. CaF2

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

1. CH4
2. SF4
3. BF4-
4. NH4+