Question

select the pair of compounds that you would expect to form a homogeneous solution based on intermolecular forces.

\\(\text{cbr}_4\\) and \\(\text{nh}_3\\)
\\(\text{br}_2\\) and \\(\text{hcl}\\)
\\(\text{nh}_3\\) and \\(\text{h}_2\text{o}\\)
\\(\text{ccl}_4\\) and \\(\text{h}_2\text{o}\\)

Explanation:

Analyze the "like dissolves like" principle

Using the Intermolecular Forces knowledge point

• Substances with similar intermolecular forces tend to be soluble in one another (forming a homogeneous solution).
• Polar solutes dissolve in polar solvents (e.g., dipole-dipole interactions or hydrogen bonding).
• Nonpolar solutes dissolve in nonpolar solvents (e.g., London dispersion forces).

Evaluate the given pairs of compounds

Using the Hydrogen Bonding and Intermolecular Forces knowledge points

• \(\text{CBr}_4\) (nonpolar, London dispersion forces) and \(\text{NH}_3\) (polar, hydrogen bonding): Dissimilar forces; unlikely to form a homogeneous solution.
• \(\text{Br}_2\) (nonpolar, London dispersion forces) and \(\text{HCl}\) (polar, dipole-dipole): Dissimilar forces; unlikely to form a homogeneous solution.
• \(\text{NH}_3\) (polar, hydrogen bonding) and \(\text{H}_2\text{O}\) (polar, hydrogen bonding): Similar forces; both form strong hydrogen bonds with each other, leading to high solubility and a homogeneous solution.
• \(\text{CCl}_4\) (nonpolar, London dispersion forces) and \(\text{H}_2\text{O}\) (polar, hydrogen bonding): Dissimilar forces; immiscible.

Identify the correct option

Using the Intermolecular Forces knowledge point

• The pair \(\text{NH}_3\) and \(\text{H}_2\text{O}\) shares highly compatible intermolecular forces, making them miscible.

Answer:

• (A) \(\text{CBr}_4\) and \(\text{NH}_3\)
• (B) \(\text{Br}_2\) and \(\text{HCl}\)
• (C) \(\text{NH}_3\) and \(\text{H}_2\text{O}\) (Correct answer)
• (D) \(\text{CCl}_4\) and \(\text{H}_2\text{O}\)