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Is Matter Around Us Pure Test - 33

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Is Matter Around Us Pure Test - 33
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  • Question 1
    1 / -0
    A small boy mischievously mixed small pebbles into a bag of pulses. What method will you employ to separate the mixture?
    Solution
    Size of pebbles is sufficiently large for them to be handpicked from a bag of pulses. 
    So, option C is correct.
  • Question 2
    1 / -0
    A homogeneous mixture is:
    Solution

    Hint: Homogeneous mixture has a uniform composition.

    Correct Answer: Option B

    Explanation:

    When two or more components remain in a single-phase throughout the mixture and their properties cannot be distinguished, then the mixture is called a homogeneous mixture.

    Hence, a homogeneous mixture is one in which components cannot be distinguished.

  • Question 3
    1 / -0
    How is scrap-iron separated from other wastes in a scrap yard?
    Solution
    Waste materials supplied to factories contain a number of scrap metals including iron ore. So, in factories, scrap iron is separated from the heap of waste materials by using big electromagnets fitted to a crane. 
    Option BB is correct.
  • Question 4
    1 / -0
    Separating funnel is used to separate immiscible liquids based on their:
    Solution
    Separating funnel works on the principle that immiscible liquids separate out in layers depending on their densities. 

    Distillation leverages the difference in boiling points of homogeneous mixtures to separate the components. Substances that sublime are separated using sublimation method. Substances with magnetic properties are separated using magnetic separation techniques.
  • Question 5
    1 / -0
    A vendor sells white powdered salt mixed with white powdered stone. The knowledge of which property will help you detect this malpractice?
    Solution
    The purity of the solid salt sample can be anaylsed simply by the property of solubility. If we mix it in water, salt being water soluble will dissolve easily, while the white powdered stone will not.
  • Question 6
    1 / -0
    A pure substance can be a/an :
    Solution
    Pure substances are defined as substances that are made up of only one type of particles. Elements and compounds are made up of only one type of particles and are therefore, pure substances. 
  • Question 7
    1 / -0
    Which of the following statement is not true about colloidal solution ?
    Solution
    In colloidal solution, a material is evenly suspended in a liquid, e.g., milk or oil in water is a colloidal solution which is present in two phases in heterogenous phase, e.g., foams, emulsions, sols.
  • Question 8
    1 / -0
    Compounds have:
    Solution
    A chemical compound is a chemical substance composed of many identical molecules composed of atoms from more than one element held together by chemical bonds. A chemical element bonded to an identical chemical element is not a chemical compound since only one element not two different elements is involved.

  • Question 9
    1 / -0
    The principle behind fractional distillation technique in separation of two liquids is :
    Solution
    Fractional distillation is the separation of a mixture into its component parts or fractions such as in separating chemical compounds by their boiling point by heating them to a temperature at which one or more fractions of compound will vaporize.
  • Question 10
    1 / -0
    Carbon burns in oxygen to form carbon dioxide. The properties of carbon dioxide are:
    Solution
    CO2CO_2 is a compound which has different properties from its constituents, carbon, and oxygen.
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