Multiple choice

Which of the following statements is not true about colloids?

  1. Colloids are quite stable.

  2. The particles of all colloids can be seen with a microscope.

  3. A colloid is a homogeneous mixture.

  4. The particles of colloids can pass through a filter paper.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A colloidal solution is a heterogeneous mixture in which the size of the particle is in the range of 1-100 nm in diameter. Due to the small size of particles, these mixtures appear to be homogeneous, but actually they are heterogeneous. Moreover, the colloidal particles pass through ordinary filter paper. Hence, they cannot be separated by filtration. The colloidal particles are not visible to the naked eye. However, in some cases, they are visible under ultramicroscope. So, only option (3), i.e. a colloid is a homogeneous mixture, is an incorrect statement about colloids. 

Keep practicing — related questions