Question

Dissolution of a non-volatile solute into a liquid leads to:

• A. a decrease of entropy
• B. an increase in tendency of the liquid to freeze
• C. an increase in tendency to pass into the vapour phase
• D. a decrease in tendency of the liquid to freeze

Answer 1

The correct option is D a decrease in tendency of the liquid to freeze

The freezing point of a liquid is that temperature at which the liquid and its solid state exist in equilibrium with each other. It may be defined as the temperature at which the liquid and solid states of a substance have the same vapour pressure.
When a non-volatile non-electrolyte is dissolved in a pure solvent the vapour pressure of the solvent is lowered so addition of non-volatile solutes decreases the freezing point of solution.