Ncert – class 6- science – Chapter 3: Separation of Substances 1 Welcome to your Ncert - class 6- science - Chapter 3: Separation of Substances 1 1. Evaporation followed by condensation occurs in: Distillation Evaporation Filtration Sublimation None 2. How will you test given solution is saturated or not? Add more solute, if it dissolves, it is unsaturated Add more solute, if it does not dissolve, it is unsaturated Add more solute, if it dissolves, it is saturated None of the above None 3. What is a saturated solution? A solution in which the maximum amount of solute is dissolved under any conditions A solution that is full of solid substance A solution in which the maximum amount of solute is dissolved under the current conditions A solution in which the minimum amount of solute is dissolved under the current conditions None 4. 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 None of these 23 4 None 5. Which technique can be used to separate iron from a mixture of iron and copper? Solvent extraction Sedimentation Magnetic separation Sublimation None 6. 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 7. Salt dissolved in water can be recovered by: 8. Which one of the following is not a term generally used to describe a solution? Concentrated Super concentrated Dilute Saturated None 9. Winnowing is useful only when: two solids have different melting points two solids have different weights two solids have different boiling points two solids have different magnetic properties None 10. 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? Handpicking - Sublimation- Sieving Sieving-Magnetic separation - Filtration Magnetic separation-Winnowing Winnowing - Magnetic separation None 11. 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? Magnetic separation Sieving Winnowing Filtration None 12. Decantation can be used to separate: heterogeneous and homogeneous solid-liquid mixtures homogeneous liquid-liquid mixtures heterogeneous solid-liquid mixtures None of the above None 13. A mixture of pepper and sand can be dissolved in water. The mixture can be separated by the method %BLANK% Filtration None 14. Threshing is a method used to separate: husk particles from grains stones from grains None of these grains from stalks None 15. A few coloured glass pieces that are big in size are mixed with sugar. The easiest way to separate them is: heat the mixture add the mixture to water handpick the sugar particles handpick the glass pieces None 16. 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 wrong statement but reason is correct statement Assertion and reason both are correct statements and reason is the correct explanation for assertion. Assertion and reason both are correct statements but the reason is not the correct explanation for assertion. Assertion is correct statement but reason is the wrong statement. None 17. Components of a mixture which are separated by sieving, get separated based on their: difference in shape difference in size difference in weight difference in colour None 18. The rate of going into the solution is equal to the rate of coming out of the solution that indicates the solution is : concentrated dilute unstaurated saturated None 19. Which of these terms indicate there is a large quantity of solute, compared with the amount of solvent, in a solution? Soluble Concentrated Dilute Exhaustible None 20. Wheat flour is separated from wheat bran by the method of: sieving handpicking filtration winnowing 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.