Ncert – class 6- science – Chapter 3: Separation of Substances 1 Welcome to your Ncert - class 6- science - Chapter 3: Separation of Substances 1 1. 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. 23 4 0.045 None of these None 2. Which of these terms indicate there is a large quantity of solute, compared with the amount of solvent, in a solution? Concentrated Dilute Soluble Exhaustible None 3. Which technique can be used to separate iron from a mixture of iron and copper? Sublimation Sedimentation Solvent extraction Magnetic separation None 4. Components of a mixture which are separated by sieving, get separated based on their: difference in size difference in colour difference in shape difference in weight None 5. Which one of the following is not a term generally used to describe a solution? Dilute Super concentrated Saturated Concentrated None 6. What is a saturated solution? 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 A solution in which the maximum amount of solute is dissolved under the current conditions None 7. Salt dissolved in water can be recovered by: 8. Decantation can be used to separate: heterogeneous and homogeneous solid-liquid mixtures homogeneous liquid-liquid mixtures None of the above heterogeneous solid-liquid mixtures None 9. The rate of going into the solution is equal to the rate of coming out of the solution that indicates the solution is : saturated unstaurated dilute concentrated None 10. A mixture of pepper and sand can be dissolved in water. The mixture can be separated by the method %BLANK% Filtration 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? Filtration Winnowing Magnetic separation Sieving None 12. 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 Crystals begin to grow All dissolving has stopped None 13. 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? Magnetic separation-Winnowing Sieving-Magnetic separation - Filtration Handpicking - Sublimation- Sieving Winnowing - Magnetic separation None 14. Wheat flour is separated from wheat bran by the method of: handpicking sieving winnowing filtration None 15. Evaporation followed by condensation occurs in: Distillation Filtration Sublimation Evaporation None 16. Threshing is a method used to separate: husk particles from grains stones from grains None of these grains from stalks None 17. A few coloured glass pieces that are big in size are mixed with sugar. The easiest way to separate them is: heat the mixture handpick the sugar particles add the mixture to water handpick the glass pieces None 18. How will you test given solution is saturated or not? Add more solute, if it dissolves, it is unsaturated Add more solute, if it dissolves, it is saturated None of the above Add more solute, if it does not dissolve, it is unsaturated None 19. 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 and reason both are correct statements but the reason is not the correct explanation for assertion. 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 is correct statement but reason is the wrong statement. None 20. Winnowing is useful only when: two solids have different weights two solids have different magnetic properties two solids have different melting points two solids have different boiling points 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.