Q. In which type of bond is the electron density concentrated between the nuclei of the bonded atoms?
A.
Ionic bond
B.
Covalent bond
C.
Metallic bond
D.
Hydrogen bond
Show solution
Solution
In a covalent bond, electrons are shared between atoms, leading to a concentration of electron density between the nuclei.
Correct Answer:
B
— Covalent bond
Learn More →
Q. In which type of hybridization does an atom use one s and three p orbitals?
A.
sp
B.
sp2
C.
sp3
D.
sp3d
Show solution
Solution
sp3 hybridization involves one s and three p orbitals, resulting in a tetrahedral geometry.
Correct Answer:
C
— sp3
Learn More →
Q. What is the bond order of a molecule with 3 bonding electrons and 1 antibonding electron?
Show solution
Solution
Bond order = (Number of bonding electrons - Number of antibonding electrons) / 2 = (3 - 1) / 2 = 1.
Correct Answer:
B
— 1
Learn More →
Q. What is the bond order of the O2 molecule?
Show solution
Solution
O2 has 12 total electrons, with 10 in bonding orbitals and 2 in antibonding orbitals. Bond order = (number of bonding electrons - number of antibonding electrons) / 2 = (10 - 2) / 2 = 4 / 2 = 2.
Correct Answer:
B
— 2
Learn More →
Q. What is the effect of increasing the temperature on the rate of a chemical reaction?
A.
Decreases the rate
B.
Increases the rate
C.
No effect
D.
Depends on the reaction
Show solution
Solution
Increasing temperature generally increases the kinetic energy of molecules, leading to more frequent and effective collisions, thus increasing the reaction rate.
Correct Answer:
B
— Increases the rate
Learn More →
Q. What is the expected bond angle in a molecule with sp2 hybridization?
A.
90 degrees
B.
120 degrees
C.
180 degrees
D.
109.5 degrees
Show solution
Solution
Molecules with sp2 hybridization have bond angles of approximately 120 degrees due to trigonal planar geometry.
Correct Answer:
B
— 120 degrees
Learn More →
Q. What is the molecular geometry of a molecule with a trigonal bipyramidal electron geometry and one lone pair?
A.
T-shaped
B.
Linear
C.
Trigonal planar
D.
Octahedral
Show solution
Solution
A trigonal bipyramidal electron geometry with one lone pair results in a T-shaped molecular geometry.
Correct Answer:
A
— T-shaped
Learn More →
Q. Which molecular shape corresponds to a molecule with sp2 hybridization?
A.
Linear
B.
Trigonal planar
C.
Tetrahedral
D.
Octahedral
Show solution
Solution
sp2 hybridization results in a trigonal planar shape due to the arrangement of three electron groups around the central atom.
Correct Answer:
B
— Trigonal planar
Learn More →
Q. Which of the following compounds has a tetrahedral molecular geometry?
A.
NH3
B.
H2O
C.
CH4
D.
CO2
Show solution
Solution
CH4 has four bonding pairs of electrons and no lone pairs, resulting in a tetrahedral molecular geometry.
Correct Answer:
C
— CH4
Learn More →
Q. Which of the following molecules has the highest dipole moment?
A.
CO2
B.
H2O
C.
CH4
D.
NH3
Show solution
Solution
H2O has a bent shape and significant electronegativity difference between H and O, resulting in a higher dipole moment compared to CO2, CH4, and NH3.
Correct Answer:
B
— H2O
Learn More →
Q. Which of the following statements about ionic bonds is true?
A.
They involve sharing of electrons.
B.
They are formed between two nonmetals.
C.
They result from the transfer of electrons.
D.
They are weaker than covalent bonds.
Show solution
Solution
Ionic bonds result from the transfer of electrons from one atom to another, typically between metals and nonmetals.
Correct Answer:
C
— They result from the transfer of electrons.
Learn More →
Showing 1 to 11 of 11 (1 Pages)