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Is Matter Around Us Pure Test - 29

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Is Matter Around Us Pure Test - 29
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  • Question 1
    1 / -0
    Which of the following method can be used to separate salt from its solution in water?
    Solution
    A mixture of salt and water contains a volatile component, water. Simple distillation follows the process of evaporation and condensation. 
    So, when salt water is distilled, water evaporates and can be condensed and collected in a separate container. Salt being non-volatile remains behind in the distillation flask. 
    Separating funnel is generally used to separate a heterogenous mixture. Salt water being homogenous can not be separated by the method. Additionally, in the filtration method, larger solid particles separate out when the mixture is filtered using a filter paper. In salt water mixture, the particles are tiny and can easily pass through a filter paper and can not be separated by the method.

    So, option B is correct.

  • Question 2
    1 / -0
    How carbon tetrachloride and water are separated?
    Solution
    Carbon tetrachloride and water are separated by using a separating funnel. Carbon tetrachloride and water are imiscible with each other. Hence, they form two layers. The density of carbon tetrachloride is more dense than water and forms lower layer. Water being less dense, forms upper layer.
  • Question 3
    1 / -0
    How will you separate two miscible liquids?
    Solution
    Distillation is used for separating a mixture of miscible liquids into its components, when both the components are miscible with each other and the difference in the boiling points of the liquid components is more than 20-25 degree celsius. 

  • Question 4
    1 / -0

    Directions For Questions

    From the following techniques :
    Distillation, filtration, fractional distillation, chromatography, crystallisation,  sublimation, evaporation, decantation, and sedimentation.

    Select the method you will use to separate :

    ...view full instructions

    Hydrated $$CuSO_4$$ from its aqueous solution.
    Solution
    Evaporation is used to separate this mixture.

    Firstly we have to heat the $$CuSO_4$$ solution to a saturated solution (about 3/4 of the water has vapourised). Then leave the solution in a beaker to cool it. When the solution is let to cool down, crystallization will occur. 

    When you cool it, be sure to cover the solution so that no impurities will go inside. After that, filter the crystal out. Then put it on a dry filter paper and let it dry.
  • Question 5
    1 / -0
    Method of separation of Common salt from sea-water is:
    Solution
    Simple distillation:
    This is good for separating a liquid from a solution. For example, water can be separated from salty water by simple distillation. This method works because the water evaporates from the solution, but is then cooled and condensed into a separate container. The salt does not evaporate and so it stays behind.

  • Question 6
    1 / -0
    Select the method you will use to separate the different constituents of ink.
    Solution
    The process of separating ink is a simple science experiment. It can be useful in identifying unknown solutions as well. Through the submersion of chromatography paper into water, any sample of ink can be separated into its respective cyan, magenta, and yellow components. The water causes the ink molecules to "travel" up the paper strip. Depending on the mass of the molecule, various pigments will travel faster than others, causing the separation. 
    Hence, the correct option is B.
  • Question 7
    1 / -0
    What type of mixture are separated by the technique of crystallisation ?
    Solution
    "Crystallization is also a chemical solid-liquid separation technique, in which mass transfer of a solute from the liquid solution to a pure solid crystalline phase occurs." 
    Therefore, crystallization is used to separate a solid-liquid mixture.
  • Question 8
    1 / -0
    Name a technique used to separate : Carbon and sulphur
    Solution
    By sublimation - Sulphur on heating directly converts into its gaseous state, which can later be converted into its solid state again. Carbon does not show the same property.
  • Question 9
    1 / -0
    The technique used to separate salt from seawater is:
    Solution
    Crystallisation is used to separate salt from seawater. In this method, pure solid (salt) crystallises out from the seawater in pure form after being heated and subsequently cooled.
  • Question 10
    1 / -0
    What is the technique used to separate components of ink?
    Solution

    Chromatography can be used to separate mixtures of coloured compounds. Mixtures that are suitable for separation by chromatography include inks, dyes and colouring agents in food.

    Simple chromatography is carried out on paper. A spot of the mixture is placed near the bottom of a piece of chromatography paper and the paper is then placed upright in a suitable solvent, eg water. 

    As the solvent soaks up the paper, it carries the mixtures with it. Different components of the mixture will move at different rates. This separates the mixture out.

    Option D is correct.

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