Question

An azeotropic mixture of water $(B.P.373K)$ and nitric acid $(B.P.359K)$ is formed. Which of the following is true for the boiling point of mixture $T_{mix}$ ?

• A. $T_{mix}<359K$
• B. $T_{mix}>373K$
• C. $359K<T_{mix}<373K$
• D. Cannot be predicted

Answer 1

The correct option is B $T_{mix}>373K$

The azeotropic mixture of water and nitric acid is a maximum boiling azeotrope.The boiling point of the mixture should be more than their boiling point in pure state.
Given:
$\text{B.P of water is}373K$
$\text{B.P of nitric acid is}359K$
(b) option has a temperature value which is higher than both the temperatures.
So (b) is correct.