Most important questions of chapter of chapter Is matter around us pure
Very short answer type questions (1 mark each)
1. What happens when a saturated solution of a substance is cooled?
2. Classify the following into true solutions and colloids:
Brine, Ink, Common salt dissolved in water, Starch dissolved in water
3. Identity colloids and true solutions from the following
(a) Vinegar (b) Muddy water (c) Mist (d) Aluminium paint
4. How is matter classified on the basis of chemical constitution?
5. What is a mixture? How are mixtures classified?
6. How is the purity of a substance checked?
7. By what name is a homogeneous mixture of two or more substances called?
8. Name the method used for separating ammonium chloride from common salt.
9. Give two examples each of physical and chemical changes.
10. Name two elements and two compounds.
Short answer type questions (2 marks each)
11. Mention the main characteristics of a mixture.
12. How is the concentration of a solution expressed?
13. Give two examples each of (a) aqueous solution (b) nonaqueous solution
14. Name two advantages of preparing/using solutions.
15. Define solubility. How does solubility of a solid in water change with temperature?
16. What is the distillation process? What kind of mixtures can be separated by distillation?
17. Why is the digestion of food considered a chemical change?
18. Give two characteristics of a chemical compound.
20. Draw the diagram of experimental set-up for paper chromatography.
21. How are elements classified on the basis of chemical properties? Give two examples of each.
22. Name the techniques used during recovery of common salt from sea water and its purification.
Short answer type questions (3 marks each)
23. Mention two purposes of separating the components of a mixture.
24. What happens when the temperature of a saturated solution is increased slightly? Name the state of saturation that is metastable.
25. Why is smoke coming out of a chimney of a factory considered a suspension?
26. Name the various components of air. How is carbon dioxide removed from the air?
27. What is loading? Name the substance used in loading. What is the purpose of loading?
28. How will you differentiate between a suspension and a colloid? Give one example of each.
29. What is sedimentation? How are the finer particles of clay made to settle down quickly?
30. What is meant by mass-by-mass percent of solute in a solution?
31. What happens when,
(a) light is passed through a colloidal solution?
(b) electricity is passed through a colloidal solution?
32. Draw a flowsheet diagram shows on of various components of a mixture containing camphor, sand and iron filings.
33. The solubility of potassium nitrate at 20°C is 32 g per 100 g of water. How much salt is required to prepare 66g of its saturated solution?
Long answer type questions (5 marks each)
34. Mention two typical applications of colloids.
35. Compare the properties of a true solution, a suspension and a colloidal solution.
36. What is Tyndall effect?
37. How will you separate the components of a mixture containing two miscible liquids? Give experime
38. Describe various steps involved in the purification of water for city water supply.
39. Differentiate between physical and chemical changes.
40. Write three differences between a mixture and a chemical compound.
Very short answer type questions (1 mark each)
1. What happens when a saturated solution of a substance is cooled?
2. Classify the following into true solutions and colloids:
Brine, Ink, Common salt dissolved in water, Starch dissolved in water
3. Identity colloids and true solutions from the following
(a) Vinegar (b) Muddy water (c) Mist (d) Aluminium paint
4. How is matter classified on the basis of chemical constitution?
5. What is a mixture? How are mixtures classified?
6. How is the purity of a substance checked?
7. By what name is a homogeneous mixture of two or more substances called?
8. Name the method used for separating ammonium chloride from common salt.
9. Give two examples each of physical and chemical changes.
10. Name two elements and two compounds.
Short answer type questions (2 marks each)
11. Mention the main characteristics of a mixture.
12. How is the concentration of a solution expressed?
13. Give two examples each of (a) aqueous solution (b) nonaqueous solution
14. Name two advantages of preparing/using solutions.
15. Define solubility. How does solubility of a solid in water change with temperature?
16. What is the distillation process? What kind of mixtures can be separated by distillation?
17. Why is the digestion of food considered a chemical change?
18. Give two characteristics of a chemical compound.
20. Draw the diagram of experimental set-up for paper chromatography.
21. How are elements classified on the basis of chemical properties? Give two examples of each.
22. Name the techniques used during recovery of common salt from sea water and its purification.
Short answer type questions (3 marks each)
23. Mention two purposes of separating the components of a mixture.
24. What happens when the temperature of a saturated solution is increased slightly? Name the state of saturation that is metastable.
25. Why is smoke coming out of a chimney of a factory considered a suspension?
26. Name the various components of air. How is carbon dioxide removed from the air?
27. What is loading? Name the substance used in loading. What is the purpose of loading?
28. How will you differentiate between a suspension and a colloid? Give one example of each.
29. What is sedimentation? How are the finer particles of clay made to settle down quickly?
30. What is meant by mass-by-mass percent of solute in a solution?
31. What happens when,
(a) light is passed through a colloidal solution?
(b) electricity is passed through a colloidal solution?
32. Draw a flowsheet diagram shows on of various components of a mixture containing camphor, sand and iron filings.
33. The solubility of potassium nitrate at 20°C is 32 g per 100 g of water. How much salt is required to prepare 66g of its saturated solution?
Long answer type questions (5 marks each)
34. Mention two typical applications of colloids.
35. Compare the properties of a true solution, a suspension and a colloidal solution.
36. What is Tyndall effect?
37. How will you separate the components of a mixture containing two miscible liquids? Give experime
38. Describe various steps involved in the purification of water for city water supply.
39. Differentiate between physical and chemical changes.
40. Write three differences between a mixture and a chemical compound.
