Ncert – class 9- science – Chapter 2 – Is Matter Around Us Pure 2 Welcome to your Ncert – class 9- science – Chapter 2 – Is Matter Around Us Pure 2 1. If the boiling point difference between the two liquids is less than 25ºC, the _______ method is used to separate them. fractional distillation simple distillation distillation under reduced pressure steam distillation None 2. Which of the following statement are false regarding colloidal solution? P. Colloidal solutions are homogeneous in nature. Q. Colloidal particles pass through an ordinary filter paper. R. Colloidal particles can be seen with naked eyes. S. Colloidal particles do not settle under gravity. Q and R P and S P and R R and S None 3. Aqueous solution of a mixture contains LiCl,CuCl,NaCl and AlCl3This is shaken with ether. What is/are left in water? NaCl, AlCl3 Only NaCl LiCl,NaCl Only CuCl None 4. Two immiscible liquids are separated by? Separating funnel Fractional distillation Sublimation Chromatography None 5. Isotonic solutions are solutions having the same Osmotic pressure Surface tension Viscosity Vapour pressure None 6. A colloidal system is a two-phase system. Point out which of the following combination can not be considered a colloidal system? gas-gas solid-solid liquid-gas liquid-liquid None 7. Find out a separating technique to separate the following mixture and write a note on it. Components from dye Ammonium chaoride and salt Two immiscible liquids Two miscible liquids with large difference in boilling points None 8. Sulphur sol contains Large aggregates of sulphur molecules Discrete sulphur atoms Water dispersed in solid sulphur Discrete sulphur molecules None 9. All the substance which are made of the same kind of particles are called as ______. pure substance none of these impure substance mixture None 10. Consider the list of following substances. How many of the following are pure substances? Oxygen, fluorine, paints, hydrochloric acid, methane 1 2 3 4 None 11. Which of the following does not represent a characteristic of pure substance? It has a uniform texture throughout (homogeneous). It can be an element or a compound. It is made up of different types of particles. It has a fixed boiling point or melting point. None 12. A student was given a mixture of sulphur and iron fillings. He was told to heat the mixture and observe. What will be the colour of the compound formed? Orange Black Red Blue None 13. Which method can be applied to separate a mixture of camphor and benzoic acid? Extraction with solvent Chemical Methods Sublimation Crystallisation None 14. The maximum amount of solid solute that can be dissolved in a specified amount of a given liquid solvent does not depend upon? nature of solvent pressure temperature nature of solute None 15. Which one of the following is not represented by sols Tyndall effect Paramagnetism Flocculation Absorption None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
