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Separation of Substances Test - 10

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Separation of Substances Test - 10
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  • Question 1
    1 / -0
    Settling down of heavy particles of a solid substance in liquid while keeping it for some time is known as:
    Solution
    Sedimentation is the settling down of the solid undissolved particles in a liquid. It is one of the methods for application prior to filtration.
  • Question 2
    1 / -0
    Methods of separating sunstances from their mixtures are:
    Solution
    Methods of separation are:-
    (i) Winnowing:- Winnowing is a method of separation of chaff or husk from wheat/grains. Also called the process of separation of heavier components from lighter components by the application of wind.
    (ii) Hand Picking:- Handpicking is a method of separation used where one of the components is in small quantity. And is best for a mixture of solids, for eg- Stone in rice.
    (iii) Threshing:- Beating the stem/husk of grain/cereal plants with a machine or flail to separate grain or seeds from straw.
    (iv) Sieving:- It is a method of separation of particles of different size with the help of a sieve.
    (v) Sedimentation:- Sedimentation is the settling down of the solid undissolved particles in a liquid. It is one of the methods for application prior to filtration.
    (vi) Filtration:- It is used in the separation of solids from liquids.
    (vii) Decantation:- Process of pouring out of a liquid from a vessel without disturbing the sediments. This is called decantation.
  • Question 3
    1 / -0
    How can husk particles be separated from pulses?
    Solution
    Winnowing- Winnowing is a method of separation of chaff or husk from wheat/grains. Also called process of separation of heavier components from lighter components by the application of wind.
    Hold the container of pulses in the direction of the wind and then shake, pulses being heavier will fall straight down and husks being lighter will fall away due to the wind.
  • Question 4
    1 / -0
    Saturated solution of $$NaCl$$ on heating becomes:
    Solution
    A saturated solution is a solution that contains the maximum amount of solute that can be dissolved under the condition at which the solution exist. So saturation of solution can be achieved when any additional solute that is added results in a solid precipitate or is left off as a gas.
    Now, when a saturated solution is heated, it becomes unsaturated, because it causes an increase in kinetic energy off the dissolved particles which also cause an increase in distance between the molecules of the liquid and thus solute particles take free space present in the solvent.
    Thus a saturated solution becomes unsaturated on heating.
  • Question 5
    1 / -0
    Sieving is the method used to separate the particles of:
    Solution

    If the size of the particle is too small to be picked by hand then sieving is used for separating substances. A sieve having pores of certain size is used. The bigger particles are retained by the sieve whereas the smaller particle are passed  through it. For example, this method is used for separating bran from flour, sand from gravel, pearls of different sizes,etc.

  • Question 6
    1 / -0
    What are the advantages of handpicking methods?
    Solution
    Advantages of Handpicking Method:-
    $$\longrightarrow$$ Useful and also less time consuming for separating small quantity of mixture.
    $$\longrightarrow$$ This method does not need any special machine.
    $$\longrightarrow$$ Efficiency of using this method is higher than others.
  • Question 7
    1 / -0
    An electrolyte dissolves in water if:
    Solution
    If the hydration energy is equal to or greater than the lattice energy, then the salt is water-soluble. In salts for which the hydration energy is higher than the lattice energy, solvation occurs with a release of energy in the form of heat.
  • Question 8
    1 / -0
    Winnowing is the process used to separate particles of ____________.
    Solution
    The process of separation of lighter particles from heavier particles with the help of wind is called winnowing. This method is used for separating grains from husk.
    Hence option $$\text{A}$$ is correct.
  • Question 9
    1 / -0
    Combine harvesters are used to
    Solution

    Combine harvesters are machines that harvest, threshes, and winnows in a single operation. Combine harvesters are used in developed countries like the USA. In India, these machines can be seen in the farms of Punjab.

    Option $$D$$ is correct.

  • Question 10
    1 / -0
    Threshing is used for separating
    Solution
    Threshing is used for separating seeds from the harvested stalks.
    This can be done by either beating the stalks or by using machines.
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