Q20 / 90 · JEE Main 2019 (12 Apr Shift 2) · Chemistry

Among the following, the incorrect statement about colloids is:

  • A
    They are larger than small molecules and have high molar mass.
  • B
    They can scatter lighht.
  • Correct answer
    C
    The osmotic pressure of a collodial 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.

Solution

Due to the bigger size of colloidal particles the number of particles in a colloidal solution is comparatively small as compared to a true solution. Hence the values of colligative properties are of small order as compared to values shown by true solutions at same concentration.

Hence, the correct answer is option: 'C'.

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