Question

Given below are two statements labelled as Assertion (A) and Reason (R).
Assertion (A) : Osmotic pressure method is used to determine the molar masses of proteins, polymers etc.
Reason (R) : The magnitude of osmotic pressure is large even for very dilute solutions.
[0.77 Mark]

• A. Both A and R are true and R is the correct explanation of A
• B. Both A and R are true but R is not the correct explanation of A
• C. A is true but R is false
• D. A is false but R is true

Answer 1

The correct option is A Both A and R are true and R is the correct explanation of A

The osmotic pressure method is used to determine the molar masses of proteins, polymers and other macromolecules. This method has the advantage over other methods as pressure measurement is around the room temperature and the molarity of solution is used instead of molality.
$\therefore$ As compared to other colligative properties, its magnitude is large even for very dilute solution.