Question

Which of the following sets of conditions best describes a solution of potassium iodide as compared to pure water?

• A. Vapor pressure- higher, Freezing point-higher, Boiling point-higher
• B. Vapor pressure- higher, Freezing point-higher, Boiling point-lower
• C. Vapor pressure- higher, Freezing point-lower, Boiling point-lower
• D. Vapor pressure- lower, Freezing point-lower, Boiling point-higher
• E. Vapor pressure- lower, Freezing point-higher, Boiling point-higher

Answer 1

The correct option is D Vapor pressure- lower, Freezing point-lower, Boiling point-higher

With the addition of salt ( potassium iodide) the vapour pressure of solution decreases because of non-volatile solute and depressing in freezing point and elevation is boiling point also takes place.