JEE PYQ: Surface Chemistry Question 31
Question 31 - 2019 (12 Apr Shift 2)
Type: MCQ
Among the following, the INCORRECT statement about colloids is:
(a) They can scatter light.
(b) They are larger than small molecules and have high molar mass.
(c) The osmotic pressure of a colloidal solution is of higher order than the true solution at the same concentration.
(d) The range of diameters of colloidal particles is between 1 and 1000 nm.
Show Answer
Answer: (b)
Solution
Due to the association of solute molecules till they acquire colloidal dimensions, the osmotic pressure of a colloidal solution is of lower order than that of true solution at the same concentration. $\pi = iCRT$; $i$ (van’t Hoff factor) is less in colloidal solution than true solution. So $\pi$ (osmotic pressure) will also be less in colloidal solution.
BETA
