Chemical Bonding and Molecular Structure

In which of the following pairs, both the species are not isostructural ?

1. Diamond, Silicon carbide
2. NH3, PH3
3. XeF4, XeO4
4. SiCl4, PCl4+

Decreasing order of stability of O2, O2-, O2+ and O22- is

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

Which of the following pairs of ions are isoelectronic and isostructural ?

1. SO32-, NO3-
2. ClO3-, SO32-
3. CO32-, SO32-
4. ClO3-, CO32-

The correct bond order in the following species is

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

Which of the following options represents the correct bond order ?

1. O2- > O2 < O2+
2. O2- < O2 > O2+
3. O2- > O2 > O2+
4. O2- < O2 < O2+

Maximum bond angle at nitrogen is present in which of the following ?

1. NO2+
2. NO3-
3. NO2
4. NO2-

Which of the following species contains equal number of σ- and π-bonds ?

1. (CN)2
2. CH2(CN)2
3. HCO3-
4. XeO4

Which of the following molecules has the maximum dipole moment?

1. CO2
2. CH4
3. NH3
4. NF3

Which one of the following species has plane triangular shape?

1. N3-
2. NO3-
3. NO2-
4. CO2

XeF2 is isostructural with

1. SbCl3
2. BaCl2
3. TeF2
4. ICl2-

Which of the following is a polar molecule?

1. SiF4
2. XeF4
3. BF3
4. SF4

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

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