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Separation of Substances Test - 6

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Separation of Substances Test - 6
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  • Question 1
    1 / -0

    A few coloured glass pieces that are big in size are mixed with sugar. The easiest way to separate them is:

    Solution
    Since the size of glass particles is bigger than sugar and present in less number, so we can easily get rid of those by hand picking.
  • Question 2
    1 / -0
    Wheat flour is separated from wheat bran by the method of:
    Solution

    The method of separation of particles from a mixture based on the difference in size of particles is known as sieving. It uses sieve plates for separation of coarse particles from finer particles. Wheat flour is separated from wheat bran by the method of sieving.

  • Question 3
    1 / -0
    Salt dissolved in water can be recovered by:
    Solution
    Salt dissolved in water cannot be separated by filtration, sedimentation or decantation because the salt will not settle down or be held back by a filter paper. We can separate salt from water by heating the mixture. The water evaporates leaving behind salt.
  • Question 4
    1 / -0
    Threshing is a method used to separate:
    Solution
    A farmer uses the method of threshing to separate grains from the stalks. The stalks are beaten to separate the grain seeds.

    Whereas husk from grains is separated by winnowing and stones from grains are seperated by handpicking.

    Thus option $$C$$ is correct.
  • Question 5
    1 / -0
    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?
    Solution
    Winnowing is a traditional method in where air current is blown to separate particles of light weight and heavier weight.
  • Question 6
    1 / -0
    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?
    Solution
    Solution become saturated and then no more sugar dissolves so filtrate is a saturated solution of sugar.
    Saturation is the point at which a solution of a substance can dissolve no more of that substance and additional amounts of it will appear as a separate phase.

  • Question 7
    1 / -0
    Winnowing is used for separation of:
    Solution

    Winnowing is a farming method developed by ancient people for separating grain from the chaff. It is also used to remove weevils or other pests from stored grain. Threshing, which is the loosening of grain or seeds from the husks and straw, comes before winnowing. It is used for heterogeneous solid-solid mixtures.

  • Question 8
    1 / -0
    Threshing is a method of separation used to separate:
    Solution
    Threshing is the process of loosening the edible part of the grain from the husks and straw to which it is attached. It is the step in grain preparation after reaping and before winnowing.
    Separation of tea leaves from tea is done by filtration and, stones from rice are separated by handpicking.
    Hence option A is correct.
  • Question 9
    1 / -0

    The process of settling down of heavier, insoluble particles in an undisturbed mixture solution is called:

    Solution
    Sedimentation is a process in which the liquid is separated from the insoluble solid particles. 
    In this process, the mixture of liquid and insoluble solid is placed in a container. Due to the gravity, the heavier solid particles get settled at the bottom of the container. These solid particles are called sediment.
  • Question 10
    1 / -0

    Sieving can be used only when the components of the mixture have:

    Solution
    Sieving can be used only when the components of the mixture are of different sizes. The mixture of the component is added to the sieve. Sieve consists of a large number of pores. The particle of small size get easily pass through these pores but the components with large particle sizes are not able to pass through these pores. This way sieving separate components of a mixture of different sizes.

    Hence, option A is correct.
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