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1.	Classify the following into elements, compounds and mixtures. (a) Sodium (b) 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
Answer» Elements : Sodium, Silver, Tin and Silicon. Compounds : Calcium carbonate, Methane and carbon dioxide. Mixtures: soil, Sugar, Coal, Air, Soap and Blood.

2.	Which of the following will show "Tyndall effect "? (a) Salt solution (b) Milk (c ) Copper sulphate solution (d) Starch solution.
Answer» Tyndall effect is shown by colloidal solution. Here milk and starch solution are colloids therefore milk and starch solution will show Tyndall effect.

3.	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
Answer» The following changes are chemical changes : (a) Growth of a plant (b) Rusting of iron (d) Cooking of food (e ) Digestion of food (g) Burning of candle

4.	Nickel coin is an example of ?A. Liquid solutionB. Solid solutionC. Gaseous solutionD. None of the Above
Answer» Correct Answer - B

5.	The solution in which solvent is water is known as?A. Aqueous solutionB. Non Aqueous solutionC. No solutionD. None of the Above
Answer» Correct Answer - A

6.	In liquid solutions which acts as the solvent?A. SolidB. GasC. LiquidD. All of the above
Answer» Correct Answer - C

7.	In which mixture a precipitate is formed?A. SuspensionB. ColloidC. SolutionD. All of the above
Answer» Correct Answer - A

8.	A saturated solution becomes unsaturated on ?A. HeatingB. FreezingC. MeltingD. None of the Above
Answer» Correct Answer - A

9.	Pragya tested the solubility of three different substances at different temperatures and collected the data as given below (results are given in the following table, as grams of substance dissolved in 100 grams of water to form a saturated solution). (a) What mass of potassium nitrate would be needed to produce a saturated solution of potassium nitrate in 50 grams of water at 313 K ? (b) Pragya makes a saturated solution of potassium chloride in water at 353 K and leaves the solution to cool at room temperature. What would she observe as the solution cools ? Explain. (c ) Find the solubility of each salt at 293 K . Which salt has the highest solubility at this temperature ? (d) What is the effect of change of temperature on the solubility of a salt ?
Answer» (a) Since 62 g of potassium nitrate is dissolved in 100 g of water to prepare a saturated at 313 K, 31 g of potassium nitrate should be dissolved in 50 g of water to prepare a saturate solution at 313 K. (b) The amount of potassium chloride that should be dissolved in water to make a saturated solution increases with temperature. Thus, as the solution cools some of the potassium chloride will precipitate out of the solution. (c ) The solubility of the salts at 293 K are : Potassium nitrate-32 g Sodium chloride - 36 g Potassium chloride - 35 g Ammonium chloride - 37 g Ammonium chloride has the highest solubility at 293 K. (d ) the solubility of a salt increases with temperature.