Question

The azeotropic mixture of water and $HCl$ boils at ${108.5}^{0}C$ . This solution is:

• A. ideal
• B. non-ideal with positive deviation
• C. non-ideal with negative deviation
• D. cannot be predicated

Answer 1

The correct option is C non-ideal with negative deviation

It is non-ideal with negative deviation.

Among the two water has higher boiling point in pure state. In the solution state boiling point is higher than that of water i.e. there will be lower vapour pressure than ideal mixing case.

So, solution shows negative deviation.

Option C is correct.