Question

vapour pressure of 0.01 molal aqueous solution of urea can be increase by
a. add. of glucose
b. add of 0.1 molal urea solution
c. add of h2O
d. add of Nacl​

Answer 1

Answer:

C. Addition of Water

Explanation:

Addition of a solute decreases the vapour pressure of a liquid

Addition of water dilutes the solution thus vapour pressure of the solution increases.

Answer 2

Vapour pressure of 0.01 molal aqueous solution of urea can be increased by c) add of H2O.

• Vapour pressure of solution decreases when a none volatile solute is added to it.
• It further decreases on the addition of the solute that dissociates as vapour pressure is directly proportional to vants Hoff factor i.
• Glucose urea and NaCl decreases the vapour pressure because they are non-volatile solute.
• NaCl decreases the most because it's the value of vants Hoff factor is 2.
• H20 is not a volatile solute so it does not decrease the vapour pressure.