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. 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 2. Two immiscible liquids are separated by? Separating funnel Chromatography Sublimation Fractional distillation None 3. Sulphur sol contains Large aggregates of sulphur molecules Discrete sulphur molecules Discrete sulphur atoms Water dispersed in solid sulphur None 4. Aqueous solution of a mixture contains LiCl,CuCl,NaCl and AlCl3This is shaken with ether. What is/are left in water? Only CuCl LiCl,NaCl Only NaCl NaCl, AlCl3 None 5. All the substance which are made of the same kind of particles are called as ______. pure substance mixture impure substance none of these None 6. Which of the following does not represent a characteristic of pure substance? It is made up of different types of particles. It has a uniform texture throughout (homogeneous). It can be an element or a compound. It has a fixed boiling point or melting point. None 7. 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? Red Black Blue Orange None 8. The maximum amount of solid solute that can be dissolved in a specified amount of a given liquid solvent does not depend upon? pressure nature of solute nature of solvent temperature None 9. If the boiling point difference between the two liquids is less than 25ºC, the _______ method is used to separate them. fractional distillation steam distillation distillation under reduced pressure simple distillation None 10. Which one of the following is not represented by sols Absorption Flocculation Tyndall effect Paramagnetism None 11. Isotonic solutions are solutions having the same Osmotic pressure Vapour pressure Viscosity Surface tension None 12. Which method can be applied to separate a mixture of camphor and benzoic acid? Extraction with solvent Crystallisation Chemical Methods Sublimation None 13. A colloidal system is a two-phase system. Point out which of the following combination can not be considered a colloidal system? liquid-gas gas-gas solid-solid liquid-liquid None 14. Consider the list of following substances. How many of the following are pure substances? Oxygen, fluorine, paints, hydrochloric acid, methane 2 1 4 3 None 15. 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. R and S Q and R P and R P and S 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.
