Which of the following statements is correct regarding a solution of two compounds A and B exhibiting positive deviation from ideal behaviour?

NEET 2019

Exam: NEET
Year: 2019
Subject: Chemistry
Chapter: Solutions

NEET 2019 · Chemistry · Solutions

Which of the following statements is correct regarding a solution...

Which of the following statements is correct regarding a solution of two compounds A and

\mathrm{B}

exhibiting positive deviation from ideal behaviour?

Options

AIntermolecular attractive forces between $A-A$ and $B-B$ are stronger than those between $A-B$ .
B $\Delta_{\text{mix }} H=0$ at constant $T$ and $p$
C $\Delta_{\text{mix }} V=0$ at constant $T$ and $p$
DIntermolecular attractive forces between $A-A$ and $B-B$ are equal to those between $A-B$ .

Correct answer

A. Intermolecular attractive forces between $A-A$ and $B-B$ are stronger than those between $A-B$ .

Step-by-step solution

Solution exhibits positive deviation from ideal behaviour if the intermolecular interactions, i.e., A-B interactions are more stronger than in pure components, i.e. between

\mathrm{A}-\mathrm{B}

\mathrm{B}-\mathrm{B}

. Thus. option (a) is correct. The remaining options are valid only for ideal solutions.

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