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Question
Which of the following will show the “Tyndall effect”?
- Salt solution
- Milk
- Copper sulphate solution
- Starch solution
Solution
(b) Milk and (d) starch solutions show the Tyndall effect because they are colloidal solutions, whereas (a) salt solution and (c) copper sulphate solution are true solutions. Their particle size is too small to scatter light, so they do not show the Tyndall effect.
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