Which of the following will show the Tyndall effect why? 1) salt solution 2) milk 3) copper sulphate solution 4) starch solution

Answer: (2) and (4) Milk and starch solution exhibits Tyndall effect

The Tyndall effect is the mechanism in which the particles in a colloid scatter the rays of light that are directed at them. All colloidal solutions and some very fine suspensions exhibit this effect. Therefore, it can be used to confirm if a given solution is a colloid. Scattered light intensity depends on the colloidal particle density as well as the incident light frequency.

Examples of the Tyndall effect

  • Milk makes of a colloid comprising fat and protein globules. The light is spread when a beam of light is directed at a glass of milk. This is a perfect description of the Tyndall effect.
  • The direction of the light becomes evident when a torch is turned on in a foggy atmosphere. The water droplets in the fog are accountable for the scattering of light in this case.

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