Chemical Bonding
Q. What is the bond angle in a methane (CH4) molecule? (2023) 2023
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A.
90 degrees
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B.
109.5 degrees
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C.
120 degrees
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D.
180 degrees
Solution
The bond angle in methane (CH4) is approximately 109.5 degrees due to its tetrahedral geometry.
Correct Answer: B — 109.5 degrees
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Q. What is the geometry of a molecule with two bonding pairs and no lone pairs on the central atom? (2023)
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A.
Linear
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B.
Trigonal planar
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C.
Tetrahedral
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D.
Bent
Solution
The geometry is linear when there are two bonding pairs and no lone pairs on the central atom.
Correct Answer: A — Linear
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Q. What type of bond is formed between sodium (Na) and chlorine (Cl) in NaCl? (2019)
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A.
Covalent bond
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B.
Ionic bond
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C.
Metallic bond
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D.
Hydrogen bond
Solution
NaCl is formed by the transfer of an electron from sodium to chlorine, resulting in an ionic bond.
Correct Answer: B — Ionic bond
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Q. What type of bond is formed when two atoms share electrons? (2023)
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A.
Ionic bond
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B.
Covalent bond
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C.
Metallic bond
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D.
Hydrogen bond
Solution
A covalent bond is formed when two atoms share electrons to achieve stability.
Correct Answer: B — Covalent bond
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Q. What type of bond is formed when two atoms share electrons? (2023) 2023
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A.
Ionic bond
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B.
Covalent bond
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C.
Metallic bond
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D.
Hydrogen bond
Solution
A covalent bond is formed when two atoms share electrons to achieve stability.
Correct Answer: B — Covalent bond
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Q. What type of bond is present in O2? (2022)
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A.
Single bond
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B.
Double bond
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C.
Triple bond
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D.
Quadruple bond
Solution
O2 has a double bond, as two pairs of electrons are shared between the two oxygen atoms.
Correct Answer: B — Double bond
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Q. What type of intermolecular force is present in liquid water? (2021)
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A.
London dispersion forces
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B.
Dipole-dipole interactions
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C.
Hydrogen bonding
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D.
Ionic interactions
Solution
Liquid water exhibits hydrogen bonding due to the attraction between the hydrogen atoms of one water molecule and the oxygen atom of another.
Correct Answer: C — Hydrogen bonding
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Q. Which molecule has the highest electronegativity difference? (2021)
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A.
HCl
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B.
NaCl
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C.
CO
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D.
H2
Solution
NaCl has the highest electronegativity difference between sodium and chlorine, leading to a strong ionic bond.
Correct Answer: B — NaCl
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Q. Which of the following compounds has a dipole moment? (2023)
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A.
CO2
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B.
CH4
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C.
HCl
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D.
CCl4
Solution
HCl has a dipole moment because it is a polar molecule with a significant difference in electronegativity between hydrogen and chlorine.
Correct Answer: C — HCl
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Q. Which of the following compounds is covalent? (2019)
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A.
NaCl
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B.
MgO
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C.
H2O
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D.
CaO
Solution
H2O is a covalent compound formed by the sharing of electrons between hydrogen and oxygen atoms.
Correct Answer: C — H2O
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Q. Which of the following elements can form a triple bond? (2022)
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A.
Oxygen
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B.
Nitrogen
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C.
Carbon
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D.
Hydrogen
Solution
Nitrogen can form a triple bond, as seen in N2, where three pairs of electrons are shared between the two nitrogen atoms.
Correct Answer: B — Nitrogen
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Q. Which of the following elements is most likely to form an ionic bond? (2023)
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A.
Carbon
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B.
Oxygen
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C.
Sodium
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D.
Nitrogen
Solution
Sodium is most likely to form an ionic bond as it readily loses an electron to form Na+.
Correct Answer: C — Sodium
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Q. Which of the following elements is most likely to form an ionic bond? (2023) 2023
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A.
Carbon
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B.
Oxygen
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C.
Sodium
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D.
Nitrogen
Solution
Sodium is most likely to form an ionic bond as it readily loses an electron to form Na+.
Correct Answer: C — Sodium
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Q. Which of the following has the highest bond energy? (2023)
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A.
C-H
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B.
C-C
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C.
C=N
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D.
C≡C
Solution
C≡C (triple bond) has the highest bond energy due to the strong attraction between the two carbon atoms.
Correct Answer: D — C≡C
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Q. Which of the following has the lowest boiling point? (2023)
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A.
H2O
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B.
NH3
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C.
CH4
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D.
HF
Solution
CH4 (methane) has the lowest boiling point due to weak London dispersion forces compared to the other molecules.
Correct Answer: C — CH4
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Q. Which of the following ions has a stable octet? (2023)
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A.
Na+
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B.
Cl-
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C.
Mg2+
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D.
All of the above
Solution
All of the ions Na+, Cl-, and Mg2+ have achieved a stable octet configuration.
Correct Answer: D — All of the above
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Q. Which of the following molecules has a polar covalent bond? (2023)
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A.
Cl2
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B.
H2O
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C.
CH4
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D.
O2
Solution
Water (H2O) has a polar covalent bond due to the difference in electronegativity between hydrogen and oxygen.
Correct Answer: B — H2O
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Q. Which of the following molecules has a polar covalent bond? (2023) 2023
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A.
Cl2
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B.
H2O
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C.
CH4
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D.
O2
Solution
Water (H2O) has a polar covalent bond due to the difference in electronegativity between hydrogen and oxygen.
Correct Answer: B — H2O
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