Title Class 09 Science 2 Is Matter Around Us Pure.pdf ✅

Is Matter Around Us Pure DPP-01 [Topic: Mixtures, Types of Mixtures, Solutions, Suspension and Colloidal Solutions] Very Short Answer Type Questions 1. Name two solvents other than water that are being used at home. For what purpose(es) are they used for? 2. What does pure substance mean? 3. Which form of water is the purest form of water? 4. Which of the following statements are true for pure substances? (i) Pure substances contain only one kind of particles. (ii) Pure substances may be compounds or mixtures. (iii) Pure substances have the same composition throughout. (iv) Pure substances can be exemplified by all elements other than nickel. (a) (i) and (ii) (b) (i) and (iii) (c) (iii) and (iv) (d) (ii) and (iii) 5. Rusting of an article made up of iron is called: (i) corrosion and it is a physical as well as chemical change (ii) dissolution and it is a physical change (iii) corrosion and it is a chemical change (iv) dissolution and it is a chemical change 6. A mixture of sulphur and carbon disulphide is: (i) heterogeneous and shows Tyndall effect. (ii) homogeneous and shows Tyndall effect. (iii) heterogeneous and does not show Tyndall effect. (iv) homogeneous and does not show Tyndall effect. 7. Tincture of iodine has antiseptic properties. This solution is made by dissolving (i) iodine in potassium iodide (ii) iodine in vaseline (iii) iodine in water (iv) iodine in alcohol 8. Which of the following are homogeneous in nature? (i) ice (ii) wood (iii) soil (iv) air (a) (i) and (iii) (b) (ii) and (iv)
(c) (i) and (iv) (d) (iii) and (iv) 9. Which of the following are physical changes? (i) Melting of iron metal (ii) Rusting of iron (iii) Bending of an iron rod (iv) Drawing a wire of iron metal (a) (i), (ii) and (iii) (b) (i), (ii) and (iv) (c) (i), (iii) and (iv) (d) (ii), (iii) and (iv) 10. Which of the following are chemical changes? (i) Decaying of wood (ii) Burning of wood (iii) Sawing of wood (iv) Hammering of a nail into a piece of wood (a) (i) and (ii) (b) (ii) and (iii) (c) (iii) and (iv) (d) (i) and (iv) 11. Classify each of the following as homogeneous or heterogeneous mixtures: soda water, wood, air, soil, vinegar, filtered tea 12. How would you confirm that a colourless liquid given to you is pure water? 13. Which of the following materials fall into the category of a "pure substance"? (i) Ice (ii) Milk (iii) Iron (iv) Hydrochloric acid (v) Calcium oxide (vi) Mercury (vii) Brick (viii) Wood (ix) Air. 14. Identify the solutions among the following mixtures: (i) Soil (ii) Sea water (iii) Air (v) Soda water (iv) Coal 15. Which of the following will show "Tyndall effect"? (i) Salt solution (ii) Milk
(iii) Copper sulphate solution (iv) Starch solution 16. Two substances, A and B were made to react to form a third substance, A2B according to the following reaction: 2A + B → A2B Which of the following statements concerning this reaction are incorrect? (i) The product A2B shows the properties of substances A and B (ii) The product will always have a fixed composition (iii) The product so formed cannot be classified as a compound (iv) The product so formed is an element (a) (i), (ii) and (iii) (b) (ii), (iii) and (iv) (c) (i), (iii) and (iv) (d) (ii), (iii) and (iv) 17. Two chemical species X and Y combine together to form a product P which contains both X and Y X + Y → P X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species X, Y and P are correct? (i) P is a compound (ii) X and Y are compounds (iii) X and Y are elements (iv) P has a fixed composition (a) (i), (ii) and (iii) (b) (i), (ii) and (iv) (c) (ii), (iii) and (iv) (d) (i), (iii) and (iv) 18. State any one difference between pure and impure substances. 19. What are the two components of a solution? 20. How can you convert a saturated solution into an unsaturated solution? 21. Write the dispersed phase and dispersion medium in an emulsion. 22. Give two examples of suspension. 23. Choose the chemical change out of the following: Digestion of food, Freezing of water, Glowing of electric lamp, Mixing of iron fillings with sulphur. 24. Which type of solution is formed when milk and water is mixed uniformly? 25. Give one example for each of the following: (i) Aerosol (ii) Solution Short Answer Type Questions-1