Ncert – class 6- science – Chapter 3: Separation of Substances 2 Welcome to your Ncert - class 6- science - Chapter 3: Separation of Substances 2 1. Which is the correct order to separate salt from a mixture of salt and sand? Dissolving, Filtration, Evaporation Filtration, Evaporation, Dissolving Filtration, Dissolving, Evaporation Evaporation, Dissolving, Filtration None 2. At a particular temperature, a solution that has dissolved as much solute as it is capable of dissolving is said to be a: unsaturated solution saturated solution both A and B none of the above None 3. Winnowing is used for separation of: Homogeneous solid-solid mixtures Heterogeneous solid-solid mixtures Homogeneous solid-liquid mixtures Heterogeneous solid-liquid mixtures None 4. Winnowing is used to separate: a mixture of insoluble solid and liquid. different sized particles in the mixture. heavier and lighter particles of mixture. None of these None 5. A saturated solution of NaCl on heating : becomes supersaturated. remains saturated. vapourises becomes unsaturated. None 6. To separate a mixture in which the solid is insoluble in the liquid, and is also heavier than the liquid, which of the following methods of separation are most suited? Evaporation followed by condensation Condensation and crystallization Filtration Sedimentation and decantation None 7. Sieving can be used only when the components of the mixture have: Different lustre Different sizes Different melting points Different boiling points None 8. __________ is/are generally used for filtration. Filter paper None of these Cloth Both A and B None 9. Rakesh was preparing a true solution of sugar in water in a beaker. By chance, he added sugar in excess. He kept stirring the solution for sometime but the sugar settled down in the beaker. He filtered the solution. What will be the nature of the filtrate? Saturated solution True solution Colloidal solution Suspension None 10. What would you observe when an aqueous sugar solution is heated to dryness? Sugar gets charged Water will vaporize Sugar will be left behind in the container Sugar gets mixed with water and vaporize None 11. Which of the following process is used to obtain common salt from seawater? Distillation Filtration Sublimation Evaporation None 12. Sugar syrup, usually used to coat sweets with sugar, becomes hard when cooled. From this, we can conclude that sugar syrup is: none of these a saturated solution an unsaturated solution not a solution None 13. Which of the following represents correct statement(s)? In winnowing, the stalks are beaten to free the grain seeds. Winnowing is the process that is used to separate grain from stalks. All of the above. Winnowing is the process used to separate heavier and lighter components of a mixture by wind or by blowing air. None 14. A mixture contains two solids A and B. Solid A is light in weight while solid B is very heavy. Their sizes are almost the same. Here, A is the unwanted component. To get pure solid B, which separation method would you suggest? Threshing Filtration Winnowing Sieving None 15. Saturated solution of salt on heating: vaporises becomes unsaturated remains saturated becomes supersaturated None 16. The process of settling down of heavier, insoluble particles in an undisturbed mixture solution is called: sedimentation filtration centrifugation decantation None 17. Salt can be recovered from its solution by evaporation. Another technique which can be used for the separation of a salt from its solution is : sublimation crystallization centrifugation evaporation None 18. A solution of sugar in which some more sugar could be dissolved without changing its temperature is called a/an : unsaturated solution None of the above solid solution saturated solution None 19. In a saturated solution : Dissolved solute and undissolved solutes are in equilibrium with each other Dissolved solute < < < <<< undissolved solute None of these Dissolved solute > > > >>> undissolved solute None 20. Threshing is a method of separation used to separate: grain from stalk tea leaves from tea none of the above stones from rice 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.