Among the following, the INCORRECT statement about colloids is :
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- The range of diameters of colloidal particles is between 1 and to 1000 nm
- they are larger than small molecules and have high molar mass
- They can scatter light
- The osmotic pressure of a colloidal solution is of higher order than the true solution at the same concentration.
The Correct Option is D
Solution and Explanation
(2) Colloidal particles are bigger than ordinary molecules and have high molar mass: correct.
(3) They scatter light (Tyndall effect): correct.
(4) Colligative properties depend on the number of particles. Colloidal particles are large aggregates, so for the same concentration their number is much smaller, and the osmotic pressure is of a LOWER order than that of a true solution. Statement (4) is incorrect.
Answer: (4) The osmotic pressure of a colloidal solution is of higher order than the true solution at the same concentration.
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