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Is Matter Around Us Pure? — Science STD 9 — Question

Maharashtra BoardEnglish MediumSTD 9ScienceIs Matter Around Us Pure?2 Marks
Question
Which of the following will show Tyndall effect? Why?
  1. Salt solution.
  2. Starch solution.
  3. Milk.
  4. Copper sulphate solution.
✓

Answer

Starch solution and milk will show Tyndall effect. This is because in a milk solution and starch solution (colloidal solutions) the size of solute particles is big enough to scatter the light passing through it.

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