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Is Matter Around Us Pure Test - 19

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Is Matter Around Us Pure Test - 19
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Among the colloids cheese (C), milk (M) and smoke (S), the correct combination of the dispersed phase and dispersing medium, respectively is?
    Solution
     $$Cheese$$$$Milk$$$$Smoke$$
    $$Dispersed\ phase$$ Liquid Liquid Solid
    $$Dispersing\ medium$$ Solid Liquid Gas

  • Question 2
    1 / -0
    Which property of colloids is not dependent on the charge on colloidal particles?
    Solution
    Tyndall effect is due to the scattering of light and not due to charge. Thus, the Tyndall effect is not dependent on the charge on colloidal particles. All other properties are dependent on the electric charge.

    Hence, the correct option is $$D$$.
  • Question 3
    1 / -0
    What process would you use to separate and then collect alcohol (b.p. $$78^{\circ}C$$) from a mixture of alcohol and water ?
    Solution
    Distillation is a process that can be used to separate a pure liquid from a mixture of liquids. It works when the liquids have different boiling points. Distillation is commonly used to separate ethanol, the alcohol in alcoholic drinks, from water.

  • Question 4
    1 / -0
    How is the dye separated from black ink?
    Solution
    Chromatography is the technique used for separation of those solutes that dissolve in the same solvent. The ink that we use has water as the solvent and the dye is soluble in it. Hence, this method can be used to seperate dye from black ink.
  • Question 5
    1 / -0
    Fog can be defined as:
    Solution
    Fog is a thick cloud of tiny water droplets suspended in the atmosphere at or near the earth's surface. It is a colloid in which the water droplets (liquid) are the dispersed phase and air (gas) is the dispersing medium.
  • Question 6
    1 / -0
    A mixture of two or more miscible liquids, for which the difference in the boiling points is less than 25 K can be separated by the process called:
    Solution
    Separation of a liquid mixture into fractions differing in boiling point (and hence chemical composition) by means of distillation, typically using a fractionating column is called fractional distillation. In other words, separation process in which the volatile components (having different boiling points) and the difference is less than 25 K of a mixture (such as crude oil) are split from one another by heating the mixture in a column and collecting and condensing the vapours drawn from different levels of the column.
  • Question 7
    1 / -0
    Salt dissolves in water to form salt water. Name the solvent.
    Solution
    Salt dissolves into water to form saltwater, here salt is present as a solute and water as a solvent. Hence, the correct option is B.
  • Question 8
    1 / -0
    Give examples of the following : Solution of a liquid in  liquid  is 
    Solution

     Solvent Solute Examples
     Gas  Gas Mixture
     Gas  Liquid Water vapour in air, mist.
     Gas Solid Sublimation of a solid into a gas, smoke, storms.
     Liquid Gas $$CO_2$$ gas dissolve in water (aerated drink)
    , soda water.
     Liquid Liquid Mixture of miscible liquids e.g. alcohol in water.
     Liquid Solid Salt in water, sugar in water .
     Solid Gas Adsorption of gases over metals, hydrogen over palladium
     Solid Liquid Mercury in zinc, mercury in gold i.e. all amalgams.
     Solid Solid Homogeneous mixture of two or more metals (i.e. alloys) e.g. copper in gold.
    When two or more chemically non-reacting substances are mixed and form homo-geneous mixture is called solution.
  • Question 9
    1 / -0
    Solution equals:
    Solution
    The solution has basically two components i.e. a solvent and a solute. The component in the lower amount is the solute and the one in the higher amount is the solvent. And the two components together make up the solution.
    So. option A is correct.
  • Question 10
    1 / -0
    Syrup is an example of :
    Solution
    Syrup is a mixture of thick sticky liquid consisting of a concentrated solution of sugar and water with or without the addition of a flavoring agent or medicinal substance.
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