Class 9 Practice Level 3 – Set 1 – Is Matter Around Us Pure? Leave a Comment / By anushka kumari / August 26, 2024 Class 9 Practice Level 3 – Set 1 – Is Matter Around Us Pure? Total questions: 15 1. Which of the following statements best describes a heterogeneous mixture? Topic: Mixtures Its composition is uniform throughout. Its components are evenly distributed. It has visibly distinguishable parts. It cannot be separated by physical means. None 2. Which of the following methods can be used to determine the purity of a substance? Topic: Pure Substances Measuring its boiling point Checking its colour Observing its physical state Measuring its density None 3. Which of the following is not an advantage of using alloys over pure metals? Topic: Alloys Increased strength Improved resistance to corrosion Lower melting point Homogeneous composition None 4. Which of the following statements is true regarding chromatography? Topic: Chromatography It separates components based on their densities. It is used only for liquid mixtures. It can be used to separate and identify components of a mixture. It relies on the solubility of substances. None 5. Which of the following is an incorrect statement about mixtures? Topic: Mixtures Mixtures have variable composition. The components of a mixture retain their individual properties. Mixtures can only be separated by chemical means. Mixtures can be homogeneous or heterogeneous. None 6. Which of the following is true about the solubility of gases in liquids? Topic: Solutions It increases with increasing temperature. It decreases with increasing pressure. It decreases with increasing temperature. It is not affected by pressure. None 7. Which of the following statements is true about a saturated solution? Topic: Solutions It contains the maximum amount of solute that can be dissolved at a given temperature. It cannot be diluted. It has undissolved solute settled at the bottom. It can dissolve more solute if stirred. None 8. Which of the following methods can be used to separate a colloidal solution? Topic: Colloids Filtration Centrifugation Distillation Sublimation None 9. Which of the following properties can be used to identify a pure substance? Topic: Pure Substances Colour Melting point Volume Mass None 10. Which of the following statements about steel is incorrect? Topic: Alloys It is an alloy of iron and carbon. It is stronger than pure iron. It has a higher melting point than pure iron. It is more resistant to corrosion than pure iron. None 11. In paper chromatography, what is the role of the solvent? Topic: Chromatography To dissolve the paper To carry the sample spots along the paper To react with the sample To provide a stationary phase None 12. Which of the following is an example of a lyophilic colloid? Topic: Colloids Milk Gold solution Starch solution Ferric hydroxide solution None 13. Which factor does not affect the rate of dissolution of a solid in a liquid? Topic: Solutions Temperature Surface area of the solid Pressure Stirring None 14. Which separation technique would be most effective for purifying a solid organic compound? Topic: Separation Techniques Filtration Recrystallization Decantation Chromatography None 15. Which of the following statements about pure substances is incorrect? Topic: Pure Substances They have a fixed composition. They cannot be separated by physical means. They have variable properties throughout. They include elements and compounds. None 1 out of 15 Time's up
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