Class 9 Practice Level 2 – Set 1 – Is Matter Around Us Pure? Leave a Comment / By anushka kumari / August 26, 2024 Class 9 Practice Level 2 – Set 1 – Is Matter Around Us Pure? Total questions: 25 1. Which of the following statements about compounds is correct? Topic: Elements and Compounds They have variable compositions. They can be separated into their elements by physical means. They have properties different from their constituent elements. They are always homogeneous mixtures. None 2. Which method can be used to separate a mixture of sand and iron filings? Topic: Mixtures Filtration Decantation Magnetic separation Evaporation None 3. When sugar is dissolved in water, which process can be used to recover sugar? Topic: Solutions Filtration Sublimation Evaporation Chromatography None 4. Which of the following correctly distinguishes between a homogeneous and a heterogeneous mixture? Topic: Homogeneous and Heterogeneous Mixtures Homogeneous mixtures have uniform composition; heterogeneous mixtures do not. Heterogeneous mixtures have uniform composition; homogeneous mixtures do not. Both mixtures have uniform composition. Both mixtures do not have uniform composition. None 5. Which property is unique to colloids? Topic: Colloids Particles settle on standing. Particles scatter light. Particles are visible to the naked eye. Particles can be separated by filtration. None 6. Which of the following is a characteristic of a suspension? Topic: Suspensions Particles do not settle on standing. Particles can be separated by filtration. Particles are invisible to the naked eye. Particles are uniformly distributed. None 7. In a saline solution, the salt acts as the: Topic: Solutions Solvent Solute Colloid Suspension None 8. What is the primary factor affecting the separation of components in chromatography? Topic: Separation Techniques Boiling point Density Rate of adsorption Size of particles None 9. Why are alloys often more useful than pure metals? Topic: Alloys They are always cheaper to produce. They have enhanced properties like strength and resistance to corrosion. They are easier to separate into pure metals. They are more abundant in nature. None 10. Which of the following is true for a solution? Topic: Solutions It can be separated by simple filtration. It has a non-uniform composition. It is a homogeneous mixture. It can only be made of liquids. None 11. Which method would you use to separate a mixture of alcohol and water? Topic: Separation Techniques Filtration Decantation Distillation Chromatography None 12. Which of the following is a characteristic of a pure substance? Topic: Pure Substances It can have variable composition. It can be a mixture of different phases. It has a uniform and definite composition. It can be separated into simpler substances by physical means. None 13. Which separation technique would you use to separate cream from milk? Topic: Colloids Filtration Centrifugation Chromatography Evaporation None 14. Which of the following is an example of a heterogeneous mixture? Topic: Heterogeneous Mixtures Sugar solution Brass Oil and water Vinegar None 15. Which method can be used to separate a homogeneous mixture of two liquids? Topic: Homogeneous Mixtures Filtration Simple distillation Magnetic separation Decantation None 16. What is the principle behind the separation of a mixture by centrifugation? Topic: Separation Techniques Difference in boiling points Difference in densities Difference in solubility Difference in colour None 17. Which of the following statements about a solution is true? Topic: Solutions It can be separated by mechanical means. It has a variable composition. Its components are chemically combined It is a homogeneous mixture. None 18. What is the Tyndall effect? Topic: Colloids The separation of a mixture by filtration The scattering of light by colloidal particles The condensation of a gas The evaporation of a liquid None 19. Which of the following is a property of mixtures? Topic: Mixtures They have a fixed composition. Their components can be separated by physical means. They are always homogeneous. They have uniform properties throughout. None 20. Which of the following is not an alloy? Topic: Alloys Steel Bronze Brass Silver None 21. Which separation technique is used to separate a mixture of iodine and salt? Topic: Separation Techniques Sublimation Filtration Decantation Distillation None 22. Which of the following is not a characteristic of a pure substance? Topic: Pure Substances It has a definite boiling point. It can be separated into components by physical means. It has a uniform composition. It has consistent properties throughout. None 23. Which of the following is used to separate dyes in an ink sample? Topic: Separation Techniques Filtration Chromatography Distillation Evaporation None 24. Which property of a solution does not change with the amount of solute added? Topic: Solutions Boiling point Density Solubility Colour None 25. Air is an example of which type of mixture? Topic: Homogeneous Mixtures Heterogeneous mixture Compound Homogeneous mixture Element None 1 out of 25 Time's up
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