Question 1

Give the number of lone pairs around the central atom and the geometry of the ion SeO42-.

Accepted Answer

A) 0 lone pairs, square planar 
B) 0 lone pairs, tetrahedral 
C) 1 lone pair, distorted tetrahedron (seesaw) 
D) 1 lone pair, square pyramidal 
E) 2 lone pairs, square planar 
A) 0 lone pairs, square planar 
B) 0 lone pairs, tetrahedral 
C) 1 lone pair, distorted tetrahedron (seesaw) 
D) 1 lone pair, square pyramidal 
E) 2 lone pairs, square planar B

Question 2

Which of the following substances is/are bent? (i)H2S (ii). CO2 (iii)ClNO (iv)NH2- (v)O3

Accepted Answer

A) only (iii) 
B) only (i)and (v) 
C) only (i), (iii), and (v) 
D) all are bent except for (iv) 
E) all are bent except for (ii) 
A) only (iii) 
B) only (i)and (v) 
C) only (i), (iii), and (v) 
D) all are bent except for (iv) 
E) all are bent except for (ii) E

Question 3

N,N-diethyl-m-tolumide (DEET)is the active ingredient in many mosquito repellents.What is the hybridization state of carbon indicated by the arrow in the structure of DEET shown below?

Accepted Answer

A) sp 
B) sp2 
C) sp3 
D) sp3d 
E) sp3d2 
A) sp 
B) sp2 
C) sp3 
D) sp3d 
E) sp3d2 C

Question 4

Use VSEPR theory to predict the molecular geometry of H3O+ (hydronium ion).

Accepted Answer

Question 5

Give the number of lone pairs around the central atom and the geometry of the ion ClO2-.

Accepted Answer

A) 0 lone pairs, linear 
B) 1 lone pair, bent 
C) 2 lone pairs, bent 
D) 3 lone pairs, bent 
E) 3 lone pairs, linear 
A) 0 lone pairs, linear 
B) 1 lone pair, bent 
C) 2 lone pairs, bent 
D) 3 lone pairs, bent 
E) 3 lone pairs, linear

Question 6

Pi bonds are covalent bonds in which the electron density is concentrated above and below a plane containing the nuclei of the bonding atoms.

Accepted Answer

A) True 
 B)False

Question 7

Ibuprofen is used as an analgesic for the relief of pain, and also to help reduce fever.What is the hybridization state of oxygen indicated by the arrow in the structure of ibuprofen shown below?

Accepted Answer

A) sp 
B) sp2 
C) sp3 
D) sp3d 
E) sp3d2 
A) sp 
B) sp2 
C) sp3 
D) sp3d 
E) sp3d2

Question 8

Which should have the longer bond, O2 or O2+?

Accepted Answer

Question 9

The electrons in the delocalized molecular orbitals of benzene (C6H6)

Accepted Answer

A) are confined between two adjacent bonding atoms. 
B) are free to move around the six-membered ring. 
C) form the electron pairs in the C-H bonds of the compound. 
D) are unevenly distributed through the molecule. 
E) are responsible for the fact that the bonds between three pairs of carbon atoms in the ring are longer and stronger than the bonds between the other three pairs of carbon atoms. 
A) are confined between two adjacent bonding atoms. 
B) are free to move around the six-membered ring. 
C) form the electron pairs in the C-H bonds of the compound. 
D) are unevenly distributed through the molecule. 
E) are responsible for the fact that the bonds between three pairs of carbon atoms in the ring are longer and stronger than the bonds between the other three pairs of carbon atoms.

Question 10

The bond angle in Cl2O is expected to be approximately

Accepted Answer

A) 90° 
B) 109.5° 
C) 120° 
D) 145° 
E) 180° 
A) 90° 
B) 109.5° 
C) 120° 
D) 145° 
E) 180°

Question 11

The bond angle in SCl2 is expected to be

Accepted Answer

A) a little less than 109.5°. 
B) 109.5°. 
C) a little more than 109.5°. 
D) 120°. 
E) 180°. 
A) a little less than 109.5°. 
B) 109.5°. 
C) a little more than 109.5°. 
D) 120°. 
E) 180°.

Question 12

Which of the following substance is/are planar? (i)SO3  (ii)SO32-  (iii)NO3-  (iv)PF3 (v)BF3

Accepted Answer

A) only (i)and (ii) 
B) only (i), (iii), and (v) 
C) only (iv) 
D) all are planar except (iv) 
E) all are planar except (ii) 
A) only (i)and (ii) 
B) only (i), (iii), and (v) 
C) only (iv) 
D) all are planar except (iv) 
E) all are planar except (ii)

Question 13

Consider the species O2-, O2, and O2+. Which of these species will be paramagnetic?

Accepted Answer

A) O2 and O2- 
B) O2+ and O2 
C) O2+ and O2- 
D) only O2 
E) all three are paramagnetic 
A) O2 and O2- 
B) O2+ and O2 
C) O2+ and O2- 
D) only O2 
E) all three are paramagnetic

Question 14

According to the VSEPR theory, the molecular geometry of ammonia is

Accepted Answer

A) linear 
B) trigonal planar 
C) bent 
D) tetrahedral 
E) trigonal pyramidal 
A) linear 
B) trigonal planar 
C) bent 
D) tetrahedral 
E) trigonal pyramidal

Question 15

According to the VSEPR theory, the molecular geometry of SiCl4 is

Accepted Answer

A) linear 
B) trigonal planar 
C) bent 
D) tetrahedral 
E) trigonal pyramidal 
A) linear 
B) trigonal planar 
C) bent 
D) tetrahedral 
E) trigonal pyramidal

Question 16

According to the VSEPR theory, the molecular geometry of beryllium chloride is

Accepted Answer

A) linear 
B) trigonal planar 
C) bent 
D) tetrahedral 
E) trigonal pyramidal 
A) linear 
B) trigonal planar 
C) bent 
D) tetrahedral 
E) trigonal pyramidal

Question 17

A homonuclear diatomic molecule is a molecule composed of three atoms of the same element.

Accepted Answer

A) True 
 B)False

Question 18

The hybridization of B in the BF3 molecule is sp3.

Accepted Answer

A) True 
 B)False

Question 19

Consider the species N2-, N2, and N2+. Which of these species will be paramagnetic?

Accepted Answer

A) N2 and N2- 
B) N2+ and N2 
C) N2+ and N2- 
D) only N2- 
E) none are paramagnetic 
A) N2 and N2- 
B) N2+ and N2 
C) N2+ and N2- 
D) only N2- 
E) none are paramagnetic

Question 20

The hybridization of the central nitrogen atom in the molecule N2O is

Accepted Answer

A) sp 
B) sp2 
C) sp3 
D) sp3d 
E) sp3d2 
A) sp 
B) sp2 
C) sp3 
D) sp3d 
E) sp3d2

Exam 10: Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Give the number of lone pairs around the central atom and the geometry of the ion SeO42-.

Which of the following substances is/are bent? (i)H2S (ii). CO2 (iii)ClNO (iv)NH2- (v)O3

N,N-diethyl-m-tolumide (DEET)is the active ingredient in many mosquito repellents.What is the hybridization state of carbon indicated by the arrow in the structure of DEET shown below?

Use VSEPR theory to predict the molecular geometry of H3O+ (hydronium ion).

Give the number of lone pairs around the central atom and the geometry of the ion ClO2-.

Pi bonds are covalent bonds in which the electron density is concentrated above and below a plane containing the nuclei of the bonding atoms.

Ibuprofen is used as an analgesic for the relief of pain, and also to help reduce fever.What is the hybridization state of oxygen indicated by the arrow in the structure of ibuprofen shown below?

Which should have the longer bond, O2 or O2+?

The electrons in the delocalized molecular orbitals of benzene (C6H6)

The bond angle in Cl2O is expected to be approximately

The bond angle in SCl2 is expected to be

Which of the following substance is/are planar? (i)SO3 (ii)SO32- (iii)NO3- (iv)PF3 (v)BF3

Consider the species O2-, O2, and O2+. Which of these species will be paramagnetic?

According to the VSEPR theory, the molecular geometry of ammonia is

According to the VSEPR theory, the molecular geometry of SiCl4 is

According to the VSEPR theory, the molecular geometry of beryllium chloride is

A homonuclear diatomic molecule is a molecule composed of three atoms of the same element.

The hybridization of B in the BF3 molecule is sp3.

Consider the species N2-, N2, and N2+. Which of these species will be paramagnetic?

The hybridization of the central nitrogen atom in the molecule N2O is

Chemistry: The Study of Change

Atoms, Molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solution

Gases

Thermo-Chemistry

Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

Chemical Bonding I: Basic Concepts

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Chemistry in the Atmosphere

Entropy, Free Energy, and Equilibrium

Electrochemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metal Chemistry and Coordination Compounds

Nuclear Chemistry

Organic Chemistry

Synthetic and Natural Organic Polymers

Filters

Give the number of lone pairs around the central atom and the geometry of the ion SeO₄^2-.

Which of the following substances is/are bent? (i)H₂S (ii). CO₂ (iii)ClNO (iv)NH₂^- (v)O₃

Use VSEPR theory to predict the molecular geometry of H₃O⁺ (hydronium ion).

Give the number of lone pairs around the central atom and the geometry of the ion ClO₂^-.

Which should have the longer bond, O₂ or O₂⁺?

The electrons in the delocalized molecular orbitals of benzene (C₆H₆)

The bond angle in Cl₂O is expected to be approximately

The bond angle in SCl₂ is expected to be

Which of the following substance is/are planar? (i)SO₃ (ii)SO₃^2- (iii)NO₃^- (iv)PF₃ (v)BF₃

Consider the species O₂^-, O₂, and O₂⁺. Which of these species will be paramagnetic?

According to the VSEPR theory, the molecular geometry of SiCl₄ is

The hybridization of B in the BF₃ molecule is sp³.

Consider the species N₂^-, N₂, and N₂⁺. Which of these species will be paramagnetic?

The hybridization of the central nitrogen atom in the molecule N₂O is