Which of the following shows Tyndall effects?

1. salt solution
2. sugar solution
3. starch solution
4. copper sulphate solution

Correct Answer:  (c) starch solution    

Explanation: If a beam of light, such as that from a flashlight passes through a colloid, the light is reflected by the colloidal particles and the path of light can therefore be observed. The scattering of light by colloids is known as Tyndall effect. Tyndall effect is shown by colloidal solution