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Is Matter Around Us Pure Test - 67

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Is Matter Around Us Pure Test - 67
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  • Question 1
    1 / -0
    The example of solid solution is 
  • Question 2
    1 / -0
    Cheese is an example of:
    Solution
    Cheese is a gel (type of colloid.). In it, the dispersed phase is liquid (water) and dispersion medium is solid (fats).
  • Question 3
    1 / -0
    How will you separate a miscible solution of $$C_6H_6 + CHCl_3$$?
    Solution
    Distillation is the process of separating the constituents of a liquid by boiling it and then condensing the vapour that results.
    The boiling point of benzene $$(80^{\circ}C)$$ and chloroform is $$(61.5^{\circ}C)$$ are very close, therefore they are separated by distillation. When we distill them by water bath at $$61-65^{\circ}C$$, chloroform will evaporate at this temperature and it can be condensed and collected. When the temperature is increased to $$80^{\circ}C$$ then benzene will evaporate and can be condensed and collected.
    Hence, the correct answer is option $$C$$.
  • Question 4
    1 / -0
    If the boiling point difference between the two liquids is less than $$25^oC$$, the _______  method is used to separate them.
    Solution
    Fractional distillation is a special type of distillation designed to separate a mixture of two or more liquids that have different boiling points. The process involves heating the mixture and partial condensation of the vapors along a column (fractionating column), which is set up such that components with lower boiling points pass through the column and are collected earlier than components with higher boiling points.
    Generally, this method is used when the components present boil at less than $$25^oC$$ from each other under the pressure of one atmosphere.
  • Question 5
    1 / -0
    The boiling points of two miscible liquids, which do not form azeotropic mixture, are close to each other. Their separation is best carried out by:
    Solution
    Fractional distillation is the separation of a mixture into its component parts, or fractions. Chemical compounds are separated by heating them to a temperature at which one or more fractions of the mixture will vaporize. It uses distillation to fractionate. Fractional distillation cannot be carried out for azeotropic mixture as they have constant boiling point.


    $$\mathbf{Hence\ the\ correct\ answer\ is\ the\ option \ (B)}$$
  • Question 6
    1 / -0
    Which of the following is useful for separating pure water from a solution of salt in water?
    Solution
    Simple distillation can be used to obtain pure water from a solution of salt in water. During distillation, water is evaporated by heating. The evaporated water vapours are condensed and collected in the receiving flask. Salt remains in the distillation flask.
  • Question 7
    1 / -0
    Two immiscible liquids are separated by?
    Solution
    Separating immiscible liquids is done simply using a separating funnel. The two liquids are put into the funnel and are left for a short time to settle out and form two layers. The tap of the funnel is opened and the bottom liquid is allowed to run. The two liquids are now separate.
  • Question 8
    1 / -0
    Isotonic solutions are solutions having the same
    Solution
    An isotonic solution refers to two solutions having the same osmotic pressure across a semipermeable membrane. This state allows for the free movement of water across the membrane without changing the concentration of solutes on either side. 
  • Question 9
    1 / -0
    Methanol and acetone can be separated by:
    Solution
    Fractional distillation is employed for a separating mixture of two or more volatile liquids having a boiling point difference approx less than $$25-30^\circ C$$. Acetone has a boiling point $$60^\circ C$$, whereas methanol has a boiling point of $$65^\circ C$$. Hence, it can be separated by fractional distillation.
    Option A is correct.
  • Question 10
    1 / -0
    Water and alcohol can be separated from a mixture by?
    Solution
    To separate a mixture of alcohol (ethanol) and water, you can use a process known as fractional distillation. This technique relies on the fact that the compounds in the mixture have different boiling points. Since ethanol boils at a lower temperature $$(78.5^oC)$$ than water, the alcohol vaporizes while most of the water remains a liquid.
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