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Is Matter Around Us Pure — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceIs Matter Around Us Pure1 Mark
Question
18 Which one amongst the following will show Tyndall effect?
Common salt solution.
✓

Answer

(b) milk and (d) starch solution show Tyndall effect because they are colloidal solution.
Whereas (a) salt solution and (c) copper sulphate solution are true solution. Their particle size is too small to scatter light. So they do not show Tyndall effect.

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