Multiple Choice
Which of the following lists the bonds in order of decreasing polarity?
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13. Liquids, Solids & Intermolecular Forces
Molecular Polarity
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Which of the following molecules contains polar covalent bonds?
A
O2
B
HCl
C
Cl2
D
N2
Verified step by step guidance1
Step 1: Understand the concept of bond polarity. A polar covalent bond occurs when two atoms share electrons unequally due to a difference in electronegativity between the atoms.
Step 2: Identify the electronegativity values of the atoms involved in each molecule: O (oxygen), H (hydrogen), Cl (chlorine), and N (nitrogen).
Step 3: Analyze each molecule: O2, Cl2, and N2 are diatomic molecules composed of two identical atoms, so the electronegativity difference is zero, resulting in nonpolar covalent bonds.
Step 4: Examine HCl, which consists of hydrogen and chlorine atoms. Since hydrogen and chlorine have different electronegativities, the bond between them is polar covalent.
Step 5: Conclude that among the given molecules, only HCl contains polar covalent bonds due to the difference in electronegativity between H and Cl.
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