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