Which of the following will show "Tyndall effect"? Question 9 from Chapter 2. IS Matter Around Us Pure ?

(a) Salt solution
(b) Milk
(c) Copper sulphate solution
(d) Starch solution.

 Answer : Scattering of a beam of light passing through a suspension or a colloidal solution is called the Tyndall effect. Both a suspension and  a colloidal solution is a heterogeneous mixture in which the particles which may or may not be seen with naked eyes,  can scatter a beam of light passing through it.
As per the description above, following will show "Tyndall effect"

 (b) Milk

(d) Starch solution. 

This is an answered question from Chapter 2. IS Matter Around Us Pure ? of CBSE Class 9th Science

Check for Complete Exercise Solution for Chapter 2. IS Matter Around Us Pure ? | CBSE Class 9th Science