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Is Matter Around Us Pure Exercises Solutions
- Q1(a): Which separation techniques will you apply for the separation of the following? (a) Sodium chloride from its solution in water
- Q1(b): Which separation techniques will you apply for the separation of the following? (b) Ammonium chloride from a mixture containing sodium chloride and ammonium chloride
- Q1(c): Which separation techniques will you apply for the separation of the following? (c) Small pieces of metal in the engine oil of a car
- Q1(d): Which separation techniques will you apply for the separation of the following? (d) Different pigments from an extract of flower petals
- Q1(e): Which separation techniques will you apply for the separation of the following? (e) Butter from curd
- Q1(f): Which separation techniques will you apply for the separation of the following? (f) Oil from water
- Q1(g): Which separation techniques will you apply for the separation of the following? (g) Tea leaves from tea
- Q1(h): Which separation techniques will you apply for the separation of the following? (h) Iron pins from sand
- Q1(i): Which separation techniques will you apply for the separation of the following? (i) Wheat grains from husk
- Q1(j): Which separation techniques will you apply for the separation of the following? (j) Fine mud particles suspended in water
- Q2: Write the steps you would use for making tea. Use the words solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.
- Q3(a): 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?
- Q3(b): 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). (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.
- Q3(c): 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). (c) Find the solubility of each salt at 293 K. Which salt has the highest solubility at this temperature?
- Q3(d): 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). (d) What is the effect of change of temperature on the solubility of a salt?
- Q4(a): Explain the following giving examples. (a) Saturated solution
- Q4(b): Explain the following giving examples. (b) Pure substance
- Q4(c): Explain the following giving examples. (c) Colloid
- Q4(d): Explain the following giving examples. (d) Suspension
- Q5: Classify each of the following as a homogeneous or heterogeneous mixture. soda water, wood, air, soil, vinegar, filtered tea.
- Q6: How would you confirm that a colourless liquid given to you is pure water?
- Q7(a): Which of the following materials fall in the category of a “pure substance”? (a) Ice
- Q7(b): Which of the following materials fall in the category of a “pure substance”? (b) Milk
- Q7(c): Which of the following materials fall in the category of a “pure substance”? (c) Iron
- Q7(d): Which of the following materials fall in the category of a “pure substance”? (d) Hydrochloric acid
- Q7(e): Which of the following materials fall in the category of a “pure substance”? (e) Calcium oxide
- Q7(f): Which of the following materials fall in the category of a “pure substance”? (f) Mercury
- Q7(g): Which of the following materials fall in the category of a “pure substance”? (g) Brick
- Q7(h): Which of the following materials fall in the category of a “pure substance”? (h) Wood
- Q7(i): Which of the following materials fall in the category of a “pure substance”? (i) Air
- Q8(a): Identify the solutions among the following mixtures. (a) Soil
- Q8(b): Identify the solutions among the following mixtures. (b) Sea water
- Q8(c): Identify the solutions among the following mixtures. (c) Air
- Q8(d): Identify the solutions among the following mixtures. (d) Coal
- Q8(e): Identify the solutions among the following mixtures. (e) Soda water
- Q9(a): Which of the following will show “Tyndall effect”? (a) Salt solution
- Q9(b): Which of the following will show “Tyndall effect”? (b) Milk
- Q9(c): Which of the following will show “Tyndall effect”? (c) Copper sulphate solution
- Q9(d): Which of the following will show “Tyndall effect”? (d) Starch solution
- Q10(a): Classify the following into elements, compounds and mixtures. (a) Sodium
- Q10(b): Classify the following into elements, compounds and mixtures. (b) Soil
- Q10(c): Classify the following into elements, compounds and mixtures. (c) Sugar solution
- Q10(d): Classify the following into elements, compounds and mixtures. (d) Silver
- Q10(e): Classify the following into elements, compounds and mixtures. (e) Calcium carbonate
- Q10(f): Classify the following into elements, compounds and mixtures. (f) Tin
- Q10(g): Classify the following into elements, compounds and mixtures. (g) Silicon
- Q10(h): Classify the following into elements, compounds and mixtures. (h) Coal
- Q10(i): Classify the following into elements, compounds and mixtures. (i) Air
- Q10(j): Classify the following into elements, compounds and mixtures. (j) Soap
- Q10(k): Classify the following into elements, compounds and mixtures. (k) Methane
- Q10(l): Classify the following into elements, compounds and mixtures. (l) Carbon dioxide
- Q10(m): Classify the following into elements, compounds and mixtures. (m) Blood
- Q11(a): Which of the following are chemical changes? (a) Growth of a plant
- Q11(b): Which of the following are chemical changes? (b) Rusting of iron
- Q11(c): Which of the following are chemical changes? (c) Mixing of iron filings and sand
- Q11(d): Which of the following are chemical changes? (d) Cooking of food
- Q11(e): Which of the following are chemical changes? (e) Digestion of food
- Q11(f): Which of the following are chemical changes? (f) Freezing of water
- Q11(g): Which of the following are chemical changes? (g) Burning of a candle
Chapters in CBSE - Class 9 Science
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