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? Sublimation Fractional distillation Chromatography Separating funnel None 2. Find out a separating technique to separate the following mixture and write a note on it. Two immiscible liquids Ammonium chaoride and salt Two miscible liquids with large difference in boilling points Components from dye None 3. 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 R P and S Q and R R and S None 4. Sulphur sol contains Discrete sulphur atoms Water dispersed in solid sulphur Discrete sulphur molecules Large aggregates of sulphur molecules None 5. All the substance which are made of the same kind of particles are called as ______. pure substance impure substance none of these mixture None 6. Consider the list of following substances. How many of the following are pure substances? Oxygen, fluorine, paints, hydrochloric acid, methane 3 2 1 4 None 7. Which one of the following is not represented by sols Absorption Tyndall effect Flocculation Paramagnetism None 8. 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 9. Aqueous solution of a mixture contains LiCl,CuCl,NaCl and AlCl3This is shaken with ether. What is/are left in water? Only NaCl LiCl,NaCl NaCl, AlCl3 Only CuCl None 10. 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 11. Isotonic solutions are solutions having the same Vapour pressure Viscosity Osmotic pressure Surface tension None 12. Which of the following does not represent a characteristic of pure substance? It is made up of different types of particles. It can be an element or a compound. It has a uniform texture throughout (homogeneous). It has a fixed boiling point or melting point. None 13. 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 Orange Blue Black None 14. A colloidal system is a two-phase system. Point out which of the following combination can not be considered a colloidal system? solid-solid gas-gas liquid-liquid liquid-gas None 15. Which method can be applied to separate a mixture of camphor and benzoic acid? Sublimation Chemical Methods Crystallisation Extraction with 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.
