Which of the following will show “Tyndall effect”?
A. Salt solution
B. Sugar solution
C. Soap solution
D. Copper sulphate solution
Tyndall effect is the phenomenon in which the path of the light beam becomes visible when a light beam enters a colloidal solution. The path becomes visible due to the scattering of light by the colloidal particles. Soap solution is an example of a colloidal solution and hence shows Tyndall effect. Salt solution, sugar solution and copper sulphate are examples of true solutions and do not show Tyndall effect.
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