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Is Matter Around Us Pure Test - 49

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Is Matter Around Us Pure Test - 49
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  • Question 1
    1 / -0
    Suspensions are different from colloids because:
    Solution
    Unlike colloids, the solute particles in suspensions will settle if the suspension is left undisturbed for a long time. Also, suspensions are heterogeneous mixtures as the composition is not uniform throughout the mixture.
  • Question 2
    1 / -0
    Which of the following is a property of a pure substance?
    Solution
    A pure substance consists of one type of particle and cannot be separated by physical means. It is a homogeneous substance with a fixed chemical composition. Hence option C is correct.
  • Question 3
    1 / -0
    If a liquid is suspended in another liquid, it is called:
    Solution
    Putting two or more liquids together creates an emulsion if the liquids do not mix. If a liquid is suspended in another liquid, it is called an emulsion.
  • Question 4
    1 / -0
    A suspension is a 
    Solution
    Hint: A heterogeneous mixture is a mixture in which the composition is not uniform throughout the mixture.

    Correct answer: Option $$B$$

    Explanation of correct option:
    A suspension is defined as a heterogeneous mixture in which the solid particles are spread throughout the liquid without dissolving in it. Hence, it is considered a heterogeneous mixture. example: Chalk in water, muddy water, dust particles in the air.

    Explanation of incorrect option:
    • A homogeneous mixture is a mixture in which the composition is uniform throughout the mixture but suspension composition not uniform hence it is not a homogeneous mixture.
    • A heterogeneous compound is a material formed by chemically bonding two or more chemical entities but suspension has only two form of matter one is liquid and another is solid , hence it is not a heterogeneous compound.
    • A solution is a homogeneous mixture of one or more solutes dissolved in a solvent but suspension is a heterogeneous mixture of liquid and solid. 
  • Question 5
    1 / -0
    A suspension of liquid droplets or fine solid particles in a gas is called :
    Solution
    A suspension of liquid droplets or fine solid particles in a gas is called an aerosol or particulate. In the atmosphere, these consist of fine dust and soot particles, fog, clouds, etc.
    An emulsion is a type of colloid in which liquid is dispersed into another liquid medium. For example, milk, face cream, etc.
    Foam is also a type of colloid in which gas is dispersed into a liquid medium. For example, rubber, pumice, sponge, etc.
    A colloid is a mixture of two or more substances mixed together which does not chemically react with each other.
    Hence, option $$A$$ is correct.
  • Question 6
    1 / -0
    Which of the following is an example of pure substance?
    Solution
    Pure water always consists of two hydrogen and one oxygen atom. These atoms are chemically bonded to each other. Also pure gold consists of gold atoms only. Table salt (sodium chloride) cannot be separated by physical means and has a constant chemical composition. Hence, all the above examples are pure substances.
  • Question 7
    1 / -0
    Which of the following is an example of suspension?
    Solution
    A key characteristic of a suspension is that the solid particles will settle and separate over time if left alone. An example of a suspension is a mixture of water and sand. When mixed up, the sand will disperse throughout the water. If left alone, the sand will settle to the bottom.
  • Question 8
    1 / -0
    _______________ contains solid particles that are sufficiently large for sedimentation.
    Solution
    A suspension is a heterogeneous mixture containing solid particles that are sufficiently large for sedimentation. Usually, they must be larger than one micrometer.
  • Question 9
    1 / -0
    Which of these is not a colloid?
    Solution
    Milk, jelly and fog are all examples of colloids. In them, the suspended particles do not settle down when left undisturbed. On the other hand, muddy water is a suspension. It's particles (mud) settle down at the bottom if the mixture is left undisturbed for a long time.
  • Question 10
    1 / -0
    The air is compressed and cooled to get:
    Solution
    Air is a homogeneous mixture and can be separated into its components by fractional distillation. The air is compressed by increasing the pressure and is then cooled by decreasing the temperature to get liquid air.
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