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Answer the following questions:
1. Which of the following will show “Tyndall effect”?
(a). Salt solution
(b). Milk
(c). Copper sulphate solution
(d). Starch solution.
(a). Salt solution
(b). Milk
(c). Copper sulphate solution
(d). Starch solution.
Tyndall effect is shown by . Since solutions are the colloidal solutions, therefore, these will show the Tyndall effect.
2. Which of the following are chemical changes?
(a). Growth of a plant (b). Rusting of iron (c). Mixing of iron filings and sand (d). Cooking of food (e). Digestion of food (f). Freezing of water (g). Burning of a candle.
(a). Growth of a plant (b). Rusting of iron (c). Mixing of iron filings and sand (d). Cooking of food (e). Digestion of food (f). Freezing of water (g). Burning of a candle.
Chemical changes is .
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