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Is Matter Around Us Pure Test - 45

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Is Matter Around Us Pure Test - 45
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  • Question 1
    1 / -0
    The components of air can be separated because of the difference in their :
    Solution
    Air is a homogeneous mixture containing different gases. These gases have different freezing and boiling point and can be separated into its components by fractional distillation.
  • Question 2
    1 / -0
    While obtaining pure copper sulphate from an impure sample by crystallization method what will finally be obtained in the china dish?
    Solution
    In the crystallization method crystals of the pure sample are obtained from an impure sample.
    When crystallization is performed to obtain pure copper sulphate from an impure sample, crystals of pure copper sulphate are obtained in the china dish.
    Option $$B$$ is correct.
  • Question 3
    1 / -0
    Mark the correct property and identify the substance.

    The substances whose constituents can be separated by chemical or electrochemical reactions have the following properties. 
    Solution
    Compounds are substances composed of two or more elements chemically combined in a fixed proportion. Elements react to form new compounds.
  • Question 4
    1 / -0
    The mixture of acetone and water is separated by :
    Solution
    The boiling point of acetone and water is $$56^0C$$ and $$100^0C$$ respectively. Distillation is used to separate miscible liquids which have a boiling point difference of more than $$25^0C$$.

    For fractional distillation, the difference in boiling points should have been less than     $$25^0C$$

    Centrifugation and decantation processes are done to separate components of heterogeneous mixtures and not miscible liquids.
  • Question 5
    1 / -0
    Mark the statement which is included in the process of separating oxygen gas from air.
    (I) All other gases are separated from air.
    (II) The air is compressed by increasing the pressure.
    (III) The air is cooled by decreasing the temperature to get liquid air.
    Solution

    If we want oxygen gas from air, we have to separate out all the other gases present in the air. 

    The air is compressed by increasing the pressure and is then cooled by decreasing the temperature to get liquid air. 

    This liquid air is allowed to warm-up slowly in a fractional distillation column, where gases get separated at different heights depending upon their boiling points.

    Option D is correct.

  • Question 6
    1 / -0
    Two liquids having different boiling point can be separated by :
    Solution
    Distillation is a process of separation of liquids based on the difference in their boiling points.
  • Question 7
    1 / -0
    Mark the incorrect statement
      (I) Fractionating column is a long tube.
     (II) Fractionating column is provided with obstructions to the passage of vapours upwards and to the liquids downward.
    (III) Column itself is fitted with a thermometer.
    Solution
    All the above statements are true.
    Fractional distillation or liquid air is carried out in a specially designed towers. It is carried out for liquids which have very close boiling points.
  • Question 8
    1 / -0
    Mark the statement which is not true for fractional distillation of air.
    Solution
    In fractional distillation, gases get separated at different heights of the column. Fractional distillation is carried out in a specially designed column. Air is first cooled and then warmed. Nitrogen distills out first because the gas with the lowest boiling temperature evaporates, condenses, and gets collected first. Hence option D is correct.

  • Question 9
    1 / -0
    Why is crystallisation is used for obtaining pure copper sulphate from an impure sample rather than evaporation?
    Solution
    Only in the crystallization technique, solids do not get separated with solvent and they also do not decompose or get charred on heating to dryness. But, in the case of the evaporation technique, solids get evaporated with solvent. Impurities also remain dissolved in the solution after filtration and can contaminate the solid copper sulphate.
  • Question 10
    1 / -0
    The component of the solution that is dissolved in the solvent is called ?
    Solution
    The component of the solution that is dissolved in the solvent is called solute. It is usually present in lesser quantity.
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