Chemical Bonding and Molecular Structure

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

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

Some of the properties of the two species, NO3- and H3O+ are described below. Which one of them is correct?

1. Dissimilar in hybridization for the central atom with different structures.
2. Isostructural with same hybridization for the central atom.
3. Isostructural with different hybridization for the central atom.
4. Similar in hybridization for the central atom with different structures.

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-

The correct order of increasing bond angles in the following triatomic species is

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

The angular shape of ozone molecule (O3) consists of

1. 1σ and 1π bond
2. 2σ and 1π bond
3. 1σ and 2π bonds
4. 2σ and 2π bonds

In which of the following pairs, the two species are isostructural?

1. SO32- and NO3-
2. BF3 and NF3
3. BrO3- and XeO3
4. SF4 and XeF4

The correct order of C-O bond length among CO, CO32-, CO2 is

1. CO < CO32- < CO2
2. CO32- < CO2 < CO
3. CO < CO2 < CO32-
4. CO2 < CO32- < CO

Which of the following is not a correct statement?

1. Multiple bonds are always shorter than corresponding single bonds.
2. The electron-deficient molecules can act as Lewis acids.
3. The canonical structures have no real existence.
4. Every AB5 molecule does in fact have square pyramid structure.

Which of the following is not isostructural with SiCl4 ?

1. NH4+
2. SCl4
3. SO42-
4. PO43-

Which of the following species has a linear shape?

1. O3
2. NO2-
3. SO2
4. NO2+

The electronegativity difference between N and F is greater than that between N and H yet the dipole moment of NH3 (1.5 D) is larger than that of NF3 (0.2 D). This is because

1. in NH3 the atomic dipole and bond dipole are in the opposite directions whereas in NF3 these are in the same direction
2. in NH3 as well as in NF3 the atomic dipole and bond dipole are in the same direction
3. in NH3 the atomic dipole and bond dipole are in the same direction whereas in NF3 these are in opposite directions
4. in NH3 as well as in NF3 the atomic dipole and bond dipole are in opposite directions.

In which of the following molecules are all the bonds not equal?

1. NF3
2. ClF3
3. BF3
4. AlF3

Which of the following molecules has trigonal planar geometry?

1. BF3
2. NH3
3. PCl3
4. IF3

The correct order in which the O-O bond length increases in the following is

1. O2 < H2O2 < O3
2. O3 < H2O2 < O2
3. H2O2 < O2 < O3
4. O2 < O3 < H2O2

The correct sequence of increasing covalent character is represented by

1. LiCl < NaCl < BeCl2
2. BeCl2 < LiCl < NaCl
3. NaCl < LiCl < BeCl2
4. BeCl2 < NaCl < LiCl

Which of the following would have a permanent dipole moment?

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

Among the following, the pair in which the two species are not isostructural is

1. SiF4 and SF4
2. IO3- and XeO3
3. BH4- and NH4+
4. PF6- and SF6

In a regular octahedral molecule, MX6, the number of X - M - X bonds at 180 is

1. three
2. two
3. six
4. four

H2O is dipolar, whereas BeF2 is not. It is because

1. the electronegativity of F is greater than that of O
2. H2O involves hydrogen bonding whereas BeF2 is a discrete molecule
3. H2O is linear and BeF2 is angular
4. H2O is angular and BeF2 is linear.

In BrF3 molecule, the lone pairs occupy equatorial positions to minimize

1. lone pair - bond pair repulsion only
2. bond pair - bond pair repulsion only
3. lone pair - lone pair repulsion and lone pair - bond pair repulsion
4. lone pair - lone pair repulsion only.

Which one of the following statements is not correct for sigma- and pi- bonds formed between two carbon atoms?

1. sigma-bond is stronger than a pi-bond.
2. Bond energies of sigma- and pi-bonds are of the order of 264 kJ/mol and 347 kJ/mol, respectively
3. Free rotation of atoms about a sigma-bond is allowed but not in case of a pi-bond.
4. Sigma-bond determines the direction between carbon atoms but a pi-bond has no primary effect in this regard.