Class 9 Practice Level 2 – Set 2 – Is Matter Around Us Pure? Leave a Comment / By anushka kumari / August 26, 2024 Class 9 Practice Level 2 – Set 2 – Is Matter Around Us Pure? Total questions: 25 1. Which of the following mixtures is a colloid? Topic: Colloids Salt water Sugar solution Milk Alcohol and water None 2. Which of the following statements is true about suspensions? Topic: Suspensions Particles settle on standing Particles do not scatter light Particles cannot be filtered Particles in a suspension can't be separated from the mixture by filtration None 3. Which factor does not affect the solubility of a solid in a liquid? Topic: Solubility Temperature Pressure Nature of the solute Nature of the solvent None 4. What is the primary principle behind distillation? Topic: Distillation Difference in density Difference in solubility Difference in boiling points Difference in melting points None 5. Which of the following mixtures can be separated by filtration? Topic: Filtration Salt dissolved in water Sugar dissolved in tea Sand mixed with water Alcohol mixed with water None 6. Which of the following is a characteristic of a pure substance? Topic: Pure Substances It can be a mixture of elements and compounds It has a fixed composition It can be separated into components by physical methods It has variable properties None 7. Which technique would you use to separate a mixture of acetone and water? Topic: Separation Techniques Filtration Sublimation Simple distillation Magnetic separation None 8. Which of the following is an alloy? Topic: Alloys Aluminium Copper Brass Hydrogen None 9. Which of the following is an example of the Tyndall effect? Topic: Colloids Light passing through a clear glass of water Light passing through a solution of salt in water Light passing through fog Light passing through a piece of wood None 10. Which statement is true for a true solution? Topic: Solutions It scatters light The solute can be seen by the naked eyeThe solute can be seen by the naked eye It forms a homogeneous mixture It can be separated by filtration None 11. Which technique is best for separating coloured components in a dye? Topic: Separation Techniques Filtration Distillation Chromatography Evaporation None 12. Which of the following increases the solubility of a gas in a liquid? Topic: Solubility Increasing temperature Decreasing temperature Increasing pressure Decreasing pressure None 13. Which of the following is a homogeneous mixture? Topic: Homogeneous Mixtures Oil and water Sand and water Vinegar Muddy water None 14. Which method is used to separate components of a mixture by their boiling points? Topic: Separation Techniques Filtration Distillation Chromatography Decantation None 15. Which of the following statements is true for pure substances? Topic: Pure Substances They have a variable composition They can be elements or compounds They can be separated into simpler substances by physical methods They have different properties throughout None 16. Which principle is chromatography based on? Topic: Separation Techniques Difference in solubility Difference in boiling points Difference in adsorption rates Difference in density None 17. What characteristic property of colloids allows them to scatter light? Topic: Colloids Large particle size Tyndall effect Homogeneous nature High density None 18. Which of the following is an example of a homogeneous mixture? Topic: Mixtures Oil and water Sand and salt Air Ice in water None 19. Why are alloys often preferred over pure metals in industrial applications? Topic: Alloys Alloys are cheaper than pure metals Alloys are always easier to produce Alloys have improved strength and resistance to corrosion Alloys are naturally occurring None 20. Which of the following solutions can be considered saturated? Topic: Solutions A sugar solution in which no more sugar can dissolve at a given temperature A salt solution with excess salt crystals at the bottom An unsaturated salt solution A sugar solution that can still dissolve more sugar None 21. Calculate the molarity of a solution prepared by dissolving 5.85 g of NaCl (molar mass = 58.5 g/mol) in 250 mL of water. Topic: Molarity 0.2 M 0.4 M 0.6 M 0.8 M None 22. A solid object has a mass of 450 g and displaces 150 mL of water. What is its density? Topic: Density 2 g/cm³ 3 g/cm³ 4 g/cm³ 5 g/cm³ None 23. What is the percentage by mass of ethanol in a solution containing 46 g of ethanol and 54 g of water? Topic: Percentage Composition 35% 46% 54% 76% None 24. How many grams of H₂SO₄ (molar mass = 98 g/mol) are required to prepare 1 L of a 0.5 M solution? Topic: Molarity 24.5 g 34.5 g 49 g 98 g None 25. If 25 g of solute is dissolved in 500 mL of solution, What is the concentration of solution in g/L? Topic: Volume Calculation 25 g/L 50 g/L 75 g/L 100 g/L None 1 out of 25 Time's up
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