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Is Matter Around Us Pure Test - 28

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Is Matter Around Us Pure Test - 28
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  • Question 1
    1 / -0
    Brine or salt is an example of :
    Solution
    Brine is a solution of salt (sodium chloride) in water. Brine may refer to salt solutions ranging from about $$3.5 \%$$ (a typical concentration of seawater, or the lower end of solutions used for bringing foods) up to about $$26 \%$$ (a typical saturated solution, depending on temperature).
  • Question 2
    1 / -0
    In construction of a building, which of the following is used?
    Solution
    In chemistry, a mixture is a material system made up of two or more different substances which are mixed but are not combined chemically. A mixture refers to the physical combination of two or more substances on which the identities are retained and are mixed in the form of solutions, suspensions, and colloids.

    Note that a mixture:

    • consists of two or more different elements and/or compounds physically intermingled,
    • can be separated into its components by physical means, and
    • often retains many of the properties of its components.
    Cement is a mixture used in construction.
  • Question 3
    1 / -0
    Solid-gas colloid is:
    Solution
    A colloid is a type of mixture intermediate between a homogeneous mixture (also called a solution) and a heterogeneous mixture with properties also intermediate between the two.

  • Question 4
    1 / -0
    Which of the following is/are a type of homogenous mixture?
    Solution
    A true solution is a homogeneous mixture of two or more substances with a particle size of less than $$10^{-9}m$$ or $$1 \ nm$$ dissolved in the solvent.

    A suspension is a heterogeneous mixture in which particles down mixture upon standing, with particle size being over $$1000$$ nm.

    A colloid is a heterogeneous mixture in which the dispersed particles are intermediate in size between those of a true solution and suspension i.e ($$1 - 1000 \ nm$$).
  • Question 5
    1 / -0
     Which one is true solution :
    Solution
    True Solution is a homogeneous mixture of two or more substances in which substance dissolved (solute) in solvent has the particle size of less than 10-9 m or 1 nm. Simple solution of sugar in water is an example of true solution. Particles of true solution cannot be filtered through filter paper and are not visible to naked eye.
    Colloidal Solution is a heterogeneous mixture in which particle size of substance is intermediate of true solution and suspension i.e. between 1-1000 nm. Smoke from a fire is example of colloidal system in which tiny particles of solid float in air. Just like true solutions, Colloidal particles are small enough and cannot be seen through naked eye.They easily pass through filter paper. But colloidal particles are big enough to be blocked by parchment paper or animal membrane.
    blood, starch, ink : Colloidal Soln.
    sugar sol., salt sol : true soln.
  • Question 6
    1 / -0
    An example of colloids is :
    Solution
     Dispersion MediumDispersed Phase Type of colloid Example 
     GasLiquid Aerosol Fog, mist 
     GasSolid Aerosol Smoke 
     LiquidGas Foam Whipped cream 
     LiquidLiquid Emulsion Mayonnaise, hair cream 
     Liquid Solid Sol Paints, cell fluids
     Solid Gas Foam Pumice, plastic foams
     Solid Liquid Gel Jelly, cheese
     Solid Solid Solid solRuby glass (glass with dispersed metal) 
    Foam, gel and aerosol all are examples of colloid solution.

    Option D is correct.
  • Question 7
    1 / -0
    Liquid-solid colloid is :
    Solution
     Dispersion MediumDispersed Phase Type of colloid Example 
     GasLiquid Aerosol Fog, mist 
     GasSolid Aerosol Smoke 
     LiquidGas Foam Whipped cream 
     LiquidLiquid Emulsion Mayonnaise, hair cream 
     Liquid Solid Sol Paints, cell fluids
     Solid Gas Foam Pumice, plastic foams
     Solid Liquid Gel Jelly, cheese
     Solid Solid Solid solRuby glass (glass with dispersed metal) 
  • Question 8
    1 / -0
    Solid-liquid colloid is :
    Solution
     Dispersion MediumDispersed Phase Type of colloid Example 
     GasLiquid Aerosol Fog, mist 
     GasSolid Aerosol Smoke 
     LiquidGas Foam Whipped cream 
     LiquidLiquid Emulsion Mayonnaise, hair cream 
     Liquid Solid Sol Paints, cell fluids
     Solid Gas Foam Pumice, plastic foams
     Solid Liquid Gel Jelly, cheese
     Solid Solid Solid solRuby glass (glass with dispersed metal) 
    Option B is correct.
  • Question 9
    1 / -0
    How pure water is separated from salt water?
    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 10
    1 / -0
    Which of the following will scatter light?
    Solution
    Colloidal Solution: blood, starch, Milk, soap solution
    True solution: sugar sol, salt sol
    Only colloidal solution scatter light.
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