Question

A graph of vap our pressure and temperature for three different liquids X, Y, and Z is shown below : The following inferences are made : (A) X has higher intermolecular interactions compared to Y. (B) X has lower intermolecular interactions compared to Y. (C) Z has lower intermolecular interactions compared to Y. The correct inference(s) is/are :

• A. (C)
• B. (A)
• C. (B)
• D. (A) and (C)

Answer 1

The Correct Option is C

The question assess the understanding of the relationship between vapor pressure and intermolecular interactions in liquids. To solve this question, we need to analyze the graph of vapor pressure versus temperature for three different liquids: X, Y, and Z.

Key Concept: The vapor pressure of a liquid is influenced by the strength of its intermolecular forces. A liquid with strong intermolecular interactions will have a lower vapor pressure at a given temperature, while a liquid with weaker intermolecular forces will have a higher vapor pressure.

Analysis:

1. From the given information, if Liquid X has higher vapor pressure compared to Liquid Y at the same temperature, it implies that Liquid X has weaker intermolecular forces than Liquid Y.
2. Similarly, if Liquid Z has higher vapor pressure than Liquid Y at the same temperature, Liquid Z has weaker intermolecular forces than Liquid Y.

Inference:

• Option (A): "X has higher intermolecular interactions compared to Y." This statement is incorrect because higher vapor pressure indicates weaker intermolecular interactions.
• Option (B): "X has lower intermolecular interactions compared to Y." This is correct as a higher vapor pressure for X means X has weaker intermolecular forces than Y.
• Option (C): "Z has lower intermolecular interactions compared to Y." This statement may be inferred from the vapor pressure comparison but is not required for the correct answer.

Conclusion: The correct inference is option (B): X has lower intermolecular interactions compared to Y, as indicated by the higher vapor pressure.