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