Class 9 Practice Level 3 – Set 2 – Is Matter Around Us Pure? Leave a Comment / By anushka kumari / August 26, 2024 Class 9 Practice Level 3 – Set 2 – Is Matter Around Us Pure? Total questions: 15 1. Which method can be used to coagulate a colloid? Topic: Colloids Adding an electrolyte Heating the colloid Diluting the colloid Filtering the colloid None 2. In thin-layer chromatography (TLC), what is the stationary phase typically made of? Topic: Chromatography Water Silica gel or alumina Ethanol Paper None 3. Which of the following does not affect the solubility of a solid in a liquid? Topic: Solutions Temperature Nature of the solvent Nature of the solute Atmospheric pressure None 4. Which alloy is used in the manufacture of aircraft parts? Topic: Alloys Brass Bronze Stainless steel Duralumin None 5. Which of the following statements about compounds is incorrect? Topic: Pure Substances They are formed by chemical combination of two or more elements. They can be separated into their elements by physical means. They have properties different from their constituent elements. They have a fixed composition. None 6. Which property distinguishes colloids from true solutions? Topic: Colloids Ability to dissolve completely Ability to scatter light Homogeneous nature Consistent particle size None 7. Which of the following mixtures is not homogeneous? Topic: Homogeneous Mixtures Air Vinegar Brass Sand and salt None 8. Which factor does not influence the rate of dissolving of a solid solute in a solvent? Topic: Solubility Temperature Stirring Particle size of the solute Volume of solvent None 9. Which statement best describes a solution? Topic: Mixtures It is always a liquid. It has a uniform composition throughout. It can be separated by filtration. It is a heterogeneous mixture. None 10. Which of the following is an example of an aerosol? Topic: Colloids Milk Smoke Gelatine Sugar solution None 11. Which of the following separation techniques is based on the difference in solubility of components? Topic: Separation Techniques Chromatography Filtration Distillation Decantation None 12. Which of the following can increase the solubility of a gas in water? Topic: Solutions Decreasing the pressure Increasing the temperature Decreasing the temperature Stirring vigorously None 13. Which of the following is an incorrect statement about elements? Topic: Pure Substances They are pure substances. They can be broken down into simpler substances by chemical means. They have unique physical and chemical properties. They are made up of one type of atom. None 14. Which of the following is an alloy of iron and carbon? Topic: Alloys Brass Bronze Steel Duralumin None 15. Which of the following methods can be used to separate a mixture of two immiscible liquids? Topic: Separation Techniques Distillation Filtration Separating funnel Chromatography None 1 out of 15 Time's up
Sign in with Google
Sign in with Facebook