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Is Matter Around Us Pure Test - 38

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Is Matter Around Us Pure Test - 38
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  • Question 1
    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 2
    1 / -0
    A pure substance is made up of:
    Solution

    All the elements and compounds are pure substances because they contain only one kind of particle. 

    For example, Hydrogen, oxygen, nitrogen, chlorine, iodine, carbon, iron, copper, etc are pure substances(elements). 

    Water, sodium chloride, hydrochloric acid, camphor, etc are pure substances (compounds).

  • Question 3
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    To separate ammonium chloride from common salt, we use:

    Solution
    The mixture of ammonium chloride and common salt can be separated by sublimation method.
    Ammonium chloride is sublimes. So on heating, ammonium chloride changes into vapours leaving common salt behind.
    Sublimation is the process in which a solid substance is directly converted into a gaseous state without first converting into the liquid state.
  • Question 4
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    Water free from dissolved impurities and gases can be obtained by:

    Solution
    Distillation is the process in which impurities and dissolved components are separated out based on their difference in boiling point, so, water-free from dissolved impurities and gases can be obtained from distillation. 
  • Question 5
    1 / -0
    A compound has:
    Solution
    Compound is a substance formed from two or more elements chemically united in fixed proportions. It has only one kind of molecule, or two or more kinds of atoms/elements.
  • Question 6
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    When a mixture of common salt and ammonium chloride is heated, white fumes are liberated which change into a white deposit as they solidify. What is this substance?

    Solution
    On heating the mixture of common salt and ammonium chloride, white fumes evolve and rise. These are fumes of ammonium chloride and not of common salt because ammonium chloride is a sublimating substance and common salt is not.
  • Question 7
    1 / -0

    We can get a pure liquid from a solution by:

    Solution
    Distillation is the process of separating the components or substances from a liquid mixture by using selective boiling and condensation.
    After condensation, we get water vapor which is purer than the water obtained by the process of evaporation, crystallization, and filtration. 
  • Question 8
    1 / -0

    Two miscible liquids are separated by:

    Solution
    • Two miscible liquids are separated by distillation. It is based on the difference in their boiling points.
    • Decantation is used to separate two immiscible liquids or solid-liquid mixtures.
    • Sublimation is used to separate components of a mixture containing a sublimable volatile solid and a non-sublimable impurity.
    • Filtration is used to separate solid-liquid mixtures.
    Hence the correct option is AA.
  • Question 9
    1 / -0

    Crude oil is purified using fractional distillation process. This method works on the principle of:

    Solution
    The different components of crude oil are called fractions. These fractions are separated from one another using a process called fractional distillation.
    This process is based on the principle that different substances boil at different temperatures.
  • Question 10
    1 / -0
    Raw natural rubber (latex) and clay in soil is a ________.
    Solution
    Colloids are important in understanding certain natural processes. 
    For example, raw natural rubber (latex) and clay in soil are colloidal in nature.
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