Which of the following will show "Tyndall effect"?

(a) Salt solution
(a) Milk
(c) Copper sulphate solution
(d) Starch solution.

Classify the following into elements, compounds and mixtures.

(a) Sodium
(a) Soil
(c) Sugar solution
(d) Silver
(e) Calcium carbonate
(f) Tin
(g) Silicon
(h) Coal
(i) Air
(j) Soap
(k) Methane
(l) Carbon dioxide
(m) Blood

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.