Which will form maximum boiling point azeotrope?

Which will form maximum boiling point azeotrope?
  1. $\mathrm{HNO}_{3}+\mathrm{H}_{2} \mathrm{O}$ solution
  2. $\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}+\mathrm{H}_{2} \mathrm{O}$ solution
  3. $\mathrm{C}_{6} \mathrm{H}_{6}+\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CH}_{3}$ solution
  4. None of these

Solution

The solutions (liquid mixture) which boils at constant temperature and can distil as such without any change in composition are called azeotropes. Solution of $\mathrm{HNO}_{3}$ and $\mathrm{H}_{2} \mathrm{O}$ will form maximum boiling point azeotrope. Maximum boiling azeotropes show negative deviation from Raoult's law. Composition (%) Boiling Point
\(\begin{array}{lll}
\text {HNO}_3 & 68.0 & 359 \mathrm{~K} \\
\mathrm{H} 20 & 32.0 & 373 \mathrm{~K}
\end{array}\)
Boiling point of the azeotrope of these two solutions is $393.5 \mathrm{~K}$.

Asked in: JEE-TOPICTESTS-CHEMISTRY

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