Is Matter Around Us Pure

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.

10. Classify the following into elements, compounds and mixtures. (a) Sodium, (b) Soil, (c) Sugar solution, (d) Silver, (e) Calcium

Which of the following will show the Tyndall effect

8. Identify the solutions among the following mixtures.(a) Soil (b) Seawater (c) Air (d) Coal (e) Soda water.