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Separation of Substances Test - 7

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Separation of Substances Test - 7
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  • Question 1
    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 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 2
    1 / -0
    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?
    Solution
    By magnetic separation- It is used to remove particle Z because Z is iron.
    Winnowing helps to separate the particle have different weight 
    It will help to separate $$X, Y$$ and $$Z$$.
  • Question 3
    1 / -0
    Winnowing is useful only when:
    Solution
    Winnowing is used to separate heavier and lighter components of a mixture by wind or by blowing air. This process is done by the farmers to separate lighter husk particles from heavier grain particles.

    So, option D is correct.
  • Question 4
    1 / -0

    Wheat flour can be separated from the wheat bran by:

    Solution
    • Hand-picking is used to separate slightly larger-sized impurities such as stones, pieces of dirt, etc. This method is used when the quantity of impurities is very less. We cannot separate wheat bran from wheat flour as wheat bran is very small in size and it cannot be hand-picked.
    • Winnowing is used to separate heavier and lighter components of a mixture by wind or by blowing air. But wheat flour and wheat bran do not have considerable weight differences therefore, winnowing cannot be used to separate them.
    • Sieving is a physical method used for the separation of particles based on their sizes. Wheat flour is separated from bran by using the sieving method because wheat flour particles are finer than wheat bran. Therefore, sieving is used to separate wheat flour and wheat bran.
    • Filtration is used to separate components of a mixture of an insoluble solid and a liquid. Wheat flour and wheat bran both are solid particles therefore filtration cannot be used to separate them.
    So, the correct answer is sieving.
  • Question 5
    1 / -0
    Decantation can be used to separate:
    Solution
    Heterogeneous mixtures are insoluble in each other. This mixture can be separated by sedimentation followed by $$Decantation$$. 
    In this process first, the heavier particles are allowed to settle down by the process of sedimentation and then they are separated by the process of decantation.

    Hence, option $$A$$ is the correct answer.
  • Question 6
    1 / -0

    How will you obtain common salt from sea water?

    Solution
    Evaporation is the method to separate dissolved solid impurities from a liquid, so if we evaporate seawater, common salt is left behind along with other solid impurities.
  • Question 7
    1 / -0
    Which one of the following is not a term generally used to describe a solution?
    Solution
    In a saturated solution, we cannot dissolve more solute under the given set of conditions. The maximum possible amount of solute is dissolved in such a solution.

    A concentrated solution is a solution that contains more solute in a given amount of solvent in comparison to another solution. The solution that contains a lesser amount of solute in comparison to the concentrated solution is known as a dilute solution.
    A dilute solution can become concentrated and a concentrated solution become a dilute solution if the reference is changed.

    Technically, there is no term such as "Super Concentrated" which can describe a solution.

    Hence, the correct option is D.
  • Question 8
    1 / -0
    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.
    Solution
    Conc. of sodium chloride $$= \dfrac{{Mass \ of \ NaCl} \times 100}{{Mass \ of \ solution}}$$
    $$=\dfrac{90 \times 100}{2090} = 4.306 $$ (% by mass)
  • Question 9
    1 / -0

    Evaporation followed by condensation occurs in:

    Solution
    Distillation is the process of separating a liquid from a mixture by evaporation followed  by condensation.
  • Question 10
    1 / -0
    The salt can be easily obtained from the salty water by the process of:
    Solution
    The process of conversion of water into vapour by heating it is called evaporation. The salt can be easily obtained from the salty water by the process of evaporation. If we boil this water, the water evaporates completely, leaving behind only the salt.
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