Ncert – class 6- science – Chapter 3: Separation of Substances 1 Welcome to your Ncert - class 6- science - Chapter 3: Separation of Substances 1 1. Salt dissolved in water can be recovered by: 2. Wheat flour is separated from wheat bran by the method of: winnowing filtration sieving handpicking None 3. Which of these terms indicate there is a large quantity of solute, compared with the amount of solvent, in a solution? Concentrated Exhaustible Soluble Dilute None 4. Evaporation followed by condensation occurs in: Sublimation Distillation Evaporation Filtration None 5. Components of a mixture which are separated by sieving, get separated based on their: difference in shape difference in weight difference in colour difference in size None 6. Which one of the following is not a term generally used to describe a solution? Saturated Super concentrated Dilute Concentrated None 7. Find out the correct statement regarding a saturated solution of salt in water? An equilibrium has been established Crystals of the solute will visibly continue to dissolve All dissolving has stopped Crystals begin to grow None 8. How will you test given solution is saturated or not? None of the above Add more solute, if it dissolves, it is saturated Add more solute, if it dissolves, it is unsaturated Add more solute, if it does not dissolve, it is unsaturated None 9. Winnowing is useful only when: two solids have different melting points two solids have different weights two solids have different magnetic properties two solids have different boiling points None 10. Threshing is a method used to separate: grains from stalks stones from grains None of these husk particles from grains None 11. The rate of going into the solution is equal to the rate of coming out of the solution that indicates the solution is : concentrated unstaurated saturated dilute None 12. A very large quantity of mixture contains tiny particles of three different substances X, Y and Z. They are of the same size, cubical in shape and yellow in colour. X particles are very heavy, insoluble, non-magnetic and contribute 50% of the mixture. Y particles are very light, insoluble, non-magnetic and contribute 40% of the mixture. And Z particles are actually iron pieces. Which of the following methods can separate X, Y and Z in the fastest manner? Winnowing - Magnetic separation Handpicking - Sublimation- Sieving Magnetic separation-Winnowing Sieving-Magnetic separation - Filtration None 13. What is a saturated solution? A solution in which the maximum amount of solute is dissolved under the current conditions A solution in which the maximum amount of solute is dissolved under any conditions A solution in which the minimum amount of solute is dissolved under the current conditions A solution that is full of solid substance None 14. Which technique can be used to separate iron from a mixture of iron and copper? Sublimation Solvent extraction Magnetic separation Sedimentation None 15. Assertion: A saturated solution is not necessarily concentrated. Reason: Dilute and concentrated are terms that signify only the relative amount of solute dissolved in a solvent Assertion is correct statement but reason is the wrong statement. Assertion and reason both are correct statements but the reason is not the correct explanation for assertion. Assertion and reason both are correct statements and reason is the correct explanation for assertion. Assertion is wrong statement but reason is correct statement None 16. 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? Winnowing Filtration Sieving Magnetic separation None 17. To make a saturated solution, 90 g of NaCl is dissolved in 2000 g of water at 293 K. Find its concentration at this temperature by mass. 0.045 23 None of these 4 None 18. A few coloured glass pieces that are big in size are mixed with sugar. The easiest way to separate them is: handpick the sugar particles heat the mixture handpick the glass pieces add the mixture to water None 19. A mixture of pepper and sand can be dissolved in water. The mixture can be separated by the method %BLANK% Filtration None 20. Decantation can be used to separate: heterogeneous solid-liquid mixtures homogeneous liquid-liquid mixtures heterogeneous and homogeneous solid-liquid mixtures None of the above 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.