Ncert – class 9- science – Chapter 2 – Is Matter Around Us Pure 1 Welcome to your Ncert - class 9- science - Chapter 2 – Is Matter Around Us Pure 1 1. Choose the incorrect option CHCl3 and CCl4 can be separated by fractional distillation Acetone and benzene can be separated by fractional distillation Glycerol cannot be separated from spent-lye in soap industries by distillation under reduce pressure. Aniline is separated from a mixture of aniline and water by the method of steam distillation None 2. Which of these is used for the separation of two miscible liquids that have sufficient difference in their boiling points? Distillation Evaporation Crystallisation Alteration None 3. Fractional distillation is used to separate liquids having an appreciable difference in their size and shape boiling points solubility None of these None 4. How will you separate a solution (miscible) of benzene and chloroform. Fractional distillation Sublimation Crystallisation Filtration None 5. A mixture consists of a soluble solid in a liquid. which method is most suitable for separating both the components? Sedimentation Winnowing Handpicking Distillation None 6. When a mixture of iron powder and sulphur powder is heated strongly to form iron sulphide then heat energy is : Neither absorbed nor released First absorbed and then released Absorbed Released None 7. Arrange true solution, colloidal solution, and suspension in the decreasing order of their particle size. True solution > Colloidal > Suspension Suspension > Colloid > True solution Suspension > True solution > Colloid Colloid > Suspension > True solution None 8. It is possible to obtain oxygen from air by fractional distillation because Oxygen is in a different group of the periodic table from Nitrogen Oxygen has higher b.p than Nitrogen Oxygen has lower density than Nitrogen Oxygen is more reactive than Nitrogen None 9. Petrol and water can be separated by ............ because................ None of these simple distillation, their boiling points slightly differ. separating funnel, they are immiscible liquids. fractional distillation, they are immiscible liquids None 10. The suitable method is to separate the following components of the mixtures.A) Two volatile liquids with appreciable differences in boiling points.B) Two or more colored constituents soluble in some solvent. A - Sublimation, B - Chromatography A - Simple distillation, B - Evaporation A - Simple distillation, B - Chromatography A - Fractional distillation, B - decantation None 11. The solvent which neither accepts nor donates proton is called________ Amphoteric Neutral Amphiprotic Aprotic None 12. Name the process used for the separation of colours in dye. Centrifugation Distillation Chromatography Decantation None 13. The copper sulphate solution during crystallization is filtered to: separate copper separate impurities form crystals All of the above None 14. Arrange the following steps in the crystallisation of copper sulphate.A. Dissolve it in a minimum amount of water.B. Take some (approximately 5 g) impure sample of copper sulphate in a china dish.C. Cover the solution with filter paper and leave it undisturbed at room temperature to cool slowly for a day.D. Evaporate water from the copper sulphate solution so as to get a saturated solution.E. Filter the impurities out. B, A, E, D, C B, D, A, C, E A, C, B, D, E B, A, D, E, C None 15. Chromatography is a word that means "colour writing". It is a technique that can be used to separate the components of a mixture.In this experiment, a marker was used to make a dot of green ink on a piece of paper. The bottom edge of the paper was placed in water and the water travelled vertically up the paper. As a result, the spot of green ink was separated into two colors: blue and yellow.Which of the following is the best explanation for the fact that the blue ink moved farther up the paper than the yellow ink in this experiment? Blue ink is more soluble in water than yellow ink is. Blue ink has a smaller molar mass than yellow ink. The density of blue ink is greater than the density of yellow ink. Molecules of blue ink are smaller in size than molecules of yellow ink None 16. Which of the following statement are true for pure substances?(i) Pure substances contain only one kind of particles.(ii) Pure substances may be compounds or mixtures.(iii) Pure substances have the same composition throughout.(iv) Pure Substances can be exemplified by all elements other than nickel. (ii) and (iii) (iii) and (iv) (i) and (ii) (i) and (iii) None 17. Matter that contains two or more constituent substances, combined in definite proportion is called______ mixture compound metalloid element None 18. The colloidal solutions of gold prepared by different methods have different colours. This is due to: The variable valency of gold Difference in size of colloidal particles Presence of different types of foreign particles Different concentration of gold None 19. Ethyl alcohol is completely miscible with water. It can be separated from this mixture by: Fractional distillation Using a separate funnel Evapouration Allowing the water to evaporate None 20. Tyndall effect observed as a result of scattering of light by particles is observed in None of these Colloidal solution True solution Suspension 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.
