CBSE Guess > Papers > Important Questions > Class IX > 2009 > Science > Science By : Mr M. p. Keshri CBSE CLASS I X Is Master Around Us Pure (Solved) Disable Pop up Blockers to View SolutionQ. 121. How many elements are known so far ?
(i) is a liquid at room temperature, (ii) Can be cut easily with knife, (iii) is the best conductor of heat , (iv) is the poorest conductor of heat.
(a) Household utensils and factory equipments, (b) Jewelries, (c) Packaging of food stuff, (d) Atomic energy and space research, (e) Transport of electricity.
(i) Aluminium, (ii) Carbon, (iii) Chlorine, (iv) Helium, (v) Silver, (vi) Sulphur, (vii) Sodium.
Q.130. State the characteristics of a compound.
(i) is crushed hard ? (ii) is heated red hot ?
(i) Sodium chloride from its solution in water. (ii) Ammonium chloride from a mixture containing sodium chloride and ammonium chloride. (iii) Small pieces of metal in the engine oil of a car. (iv) Different pigments from an extract of flower petal. (v) Butter from curd. (vi) Oil from water. (vii) Tea leaves from tea. (viii) Iron pins from sand. (ix) Wheat grains from husk. (x) Fine mud particles suspended in water.
(a) What mass of potassium nitrate would be needed to produce a saturated solution of potassium nitrate in 50 gram 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 ?
(a) Saturated Solution, (b)Pure Substance, (c) Colloid, (d) Suspension.
soda water, wood, air, soil, vinegar, filtered tea.
(a) Ice (b)Milk (c) Iron (d) Hydrochloric acid (e) Calcium oxide (f) Mercury (g) Brick (h) Wood (i) Air.
(a) Soil (b) Sea water (c) Air (d) Coal (e) Soda water.
(a) Salt solution (b) Milk (c) Copper sulphate solution (d) Starch solution.
(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.
(a) Growth of 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 candle.
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