Question 1

Find the correct statement related to the Lewis structures:

Accepted Answer

A)  Lewis structure does not show the actual structure of the chemical species, it shows only the pattern of bonding and non-bonding electron pairs. 
B)  The atoms of higher electronegativity is taken as a central atom of polyatomic species because it has to accommodate all electron pairs that are not placed in the bonds. 
C)  Lewis structure provides a very detailed information on bonding and structure. 
A)  Lewis structure does not show the actual structure of the chemical species, it shows only the pattern of bonding and non-bonding electron pairs. 
B)  The atoms of higher electronegativity is taken as a central atom of polyatomic species because it has to accommodate all electron pairs that are not placed in the bonds. 
C)  Lewis structure provides a very detailed information on bonding and structure. A

Question 2

We can say that a catalyst is selective if:

Accepted Answer

A)  it prefers one reactant over another 
B)  it gives a high yield of a desired product with a small amount of side product(s). 
C)  it is very selective for one functional group only. 
A)  it prefers one reactant over another 
B)  it gives a high yield of a desired product with a small amount of side product(s). 
C)  it is very selective for one functional group only. B

Question 3

Based on the molecular orbital theory, what can we say about the first ionization energy for H2 molecule?

Accepted Answer

A)  It is lower than the first ionization energy of H atom. 
B)  It is higher than the first ionization energy of H atom. 
C)  It is about the same as the first ionization energy of H atom. 
A)  It is lower than the first ionization energy of H atom. 
B)  It is higher than the first ionization energy of H atom. 
C)  It is about the same as the first ionization energy of H atom. B

Question 4

What is a catalytic cycle?

Accepted Answer

A)  It is a cycle of reactions that shows the interconversion of catalyst to products. 
B)  It is an energy diagram that shows the changes in energy between catalysed and uncatalyzed reaction. 
C)  It is a sequence of reactions that converts the reactants into products, with the catalyst being regenerated after the cycle. 
A)  It is a cycle of reactions that shows the interconversion of catalyst to products. 
B)  It is an energy diagram that shows the changes in energy between catalysed and uncatalyzed reaction. 
C)  It is a sequence of reactions that converts the reactants into products, with the catalyst being regenerated after the cycle.

Question 5

According to the molecular orbital theory:

Accepted Answer

A)  molecular orbitals are products of vawefunctions describing the atomic orbitals; two atomic orbitals produce only one molecular orbital 
B)  bonding molecular orbitals are lower in energy than the atomic orbitals they were formed from, while antibonding molecular orbitals have greater energy than the original atomic orbitals. 
C)  Sigma molecular orbitals are always centrosymmetric and cannot have any nodes. 
A)  molecular orbitals are products of vawefunctions describing the atomic orbitals; two atomic orbitals produce only one molecular orbital 
B)  bonding molecular orbitals are lower in energy than the atomic orbitals they were formed from, while antibonding molecular orbitals have greater energy than the original atomic orbitals. 
C)  Sigma molecular orbitals are always centrosymmetric and cannot have any nodes.

Question 6

If atom A has an s valence orbital and atom B has one s and three p valence orbitals with p orbitals being close in energy to A's s orbital, how many molecular orbitals can be formed for the AB molecule?

Accepted Answer

A)  A total of five MOs: two bonding, two antibonding and one non-bondiong 
B)  A total of four MOs: two bonding and two antibonding 
C)  A total of five: one bonding, one antibonding and three non-bonding. 
A)  A total of five MOs: two bonding, two antibonding and one non-bondiong 
B)  A total of four MOs: two bonding and two antibonding 
C)  A total of five: one bonding, one antibonding and three non-bonding.

Question 7

SF6 molecule has no lone electron pairs on sulfur. Determine: (i) the number of electrons around sulfur, (ii) the geometry of this molecule and (iii) hybridization scheme on sulfur:

Accepted Answer

A)  (i) twelve electrons, (ii) octahedral geometry, (iii) sp3d2 
B)  (i) eight electrons, (ii) octahedral geometry, (iii) sp3d2 
C)  (i) six electrons, (ii) square pyramid, (iii) sp2d2 
A)  (i) twelve electrons, (ii) octahedral geometry, (iii) sp3d2 
B)  (i) eight electrons, (ii) octahedral geometry, (iii) sp3d2 
C)  (i) six electrons, (ii) square pyramid, (iii) sp2d2

Question 8

Find the correct statement relating to bond order, bond length and bond strength:

Accepted Answer

A)  Generally, high bond order indicates high bond strength and long bond. 
B)  Generally, lower bond orders result in longer, weaker bonds. 
C)  There is no general relationship between bond order and bond strength and length. 
A)  Generally, high bond order indicates high bond strength and long bond. 
B)  Generally, lower bond orders result in longer, weaker bonds. 
C)  There is no general relationship between bond order and bond strength and length.

Question 9

According to the VSEPR model:

Accepted Answer

A)  The shape of the molecule is based on how regions of electron density are arranged in 3D space. 
B)  The shape of the molecule is based on the arrangement of atoms in 3D space, and not on the arrangement of regions of electron density. 
C)  The shape of the molecule is based on both the arrangement of atoms in 3D space and the arrangement of regions of electron density. 
A)  The shape of the molecule is based on how regions of electron density are arranged in 3D space. 
B)  The shape of the molecule is based on the arrangement of atoms in 3D space, and not on the arrangement of regions of electron density. 
C)  The shape of the molecule is based on both the arrangement of atoms in 3D space and the arrangement of regions of electron density.

Question 10

According to the VSEPR theory, the following can be said for XeF4 with two lone electron pairs on Xe atom and four Xe-F bonds:

Accepted Answer

A)  The molecular geometry is octahedral with lone electron pairs located on the equatorial plane. 
B)  The molecular geometry is square planar with two lone electron pairs on the opposite sides of the molecular plane. 
C)  The molecular geometry is see-saw and two lone electron pairs are at 90F1F1F1S1F1F1F10 to each other and all other Xe-F bonds. 
A)  The molecular geometry is octahedral with lone electron pairs located on the equatorial plane. 
B)  The molecular geometry is square planar with two lone electron pairs on the opposite sides of the molecular plane. 
C)  The molecular geometry is see-saw and two lone electron pairs are at 90F1F1F1S1F1F1F10 to each other and all other Xe-F bonds.

Find the correct statement related to the Lewis structures:

We can say that a catalyst is selective if:

Based on the molecular orbital theory, what can we say about the first ionization energy for H₂ molecule?

What is a catalytic cycle?

According to the molecular orbital theory:

If atom A has an s valence orbital and atom B has one s and three p valence orbitals with p orbitals being close in energy to A's s orbital, how many molecular orbitals can be formed for the AB molecule?

SF₆ molecule has no lone electron pairs on sulfur. Determine: (i) the number of electrons around sulfur, (ii) the geometry of this molecule and (iii) hybridization scheme on sulfur:

Find the correct statement relating to bond order, bond length and bond strength:

According to the VSEPR model:

According to the VSEPR theory, the following can be said for XeF₄ with two lone electron pairs on Xe atom and four Xe-F bonds:

Atomic Structure

Molecular Symmetry

The Structures of Simple Solids

Acids and Bases

Oxidation and Reduction

An Introduction to Coordination Compounds

Physical Techniques in Inorganic Chemistry

Periodic Trends

Hydrogen

The Group 1 Elements

The Group 2 Elements

The Group 13 Elements

The Group 14 Elements

The Group 15 Elements

The Group 16 Elements

The Group 17 Elements

The Group 18 Elements

The D-Block Elements

The D-Metal Complexes: Electronic Structure and Spectra

Coordination Chemistry: Reactions of Complexes

D-Metal Organometallic Chemistry

The F-Block Metals

Materials Chemistry and Nanomaterials

Green Chemistry

Biological Inorganic Chemistry

Inorganic Chemistry in Medicine

Filters

Exam 2: Molecular Structure and Bonding

Find the correct statement related to the Lewis structures:

We can say that a catalyst is selective if:

Based on the molecular orbital theory, what can we say about the first ionization energy for H2 molecule?

What is a catalytic cycle?

According to the molecular orbital theory:

If atom A has an s valence orbital and atom B has one s and three p valence orbitals with p orbitals being close in energy to A's s orbital, how many molecular orbitals can be formed for the AB molecule?

SF6 molecule has no lone electron pairs on sulfur. Determine: (i) the number of electrons around sulfur, (ii) the geometry of this molecule and (iii) hybridization scheme on sulfur:

Find the correct statement relating to bond order, bond length and bond strength:

According to the VSEPR model:

According to the VSEPR theory, the following can be said for XeF4 with two lone electron pairs on Xe atom and four Xe-F bonds:

Atomic Structure

Molecular Symmetry

The Structures of Simple Solids

Acids and Bases

Oxidation and Reduction

An Introduction to Coordination Compounds

Physical Techniques in Inorganic Chemistry

Periodic Trends

Hydrogen

The Group 1 Elements

The Group 2 Elements

The Group 13 Elements

The Group 14 Elements

The Group 15 Elements

The Group 16 Elements

The Group 17 Elements

The Group 18 Elements

The D-Block Elements

The D-Metal Complexes: Electronic Structure and Spectra

Coordination Chemistry: Reactions of Complexes

D-Metal Organometallic Chemistry

The F-Block Metals

Materials Chemistry and Nanomaterials

Green Chemistry

Biological Inorganic Chemistry

Inorganic Chemistry in Medicine

Filters

Based on the molecular orbital theory, what can we say about the first ionization energy for H₂ molecule?

SF₆ molecule has no lone electron pairs on sulfur. Determine: (i) the number of electrons around sulfur, (ii) the geometry of this molecule and (iii) hybridization scheme on sulfur:

According to the VSEPR theory, the following can be said for XeF₄ with two lone electron pairs on Xe atom and four Xe-F bonds: