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Is Matter Around Us Pure Test - 31

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Is Matter Around Us Pure Test - 31
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Weekly Quiz Competition
  • Question 1
    1 / -0
    On the basis of the following features identify the correct option.

    I.  They can be identified by their melting or boiling points.
    II. Their properties are different from their constituents.
    Solution
    Elements can not be further broken down into simpler constituents but the properties of compounds vary with their constituents. 

    Two elements combine to form compounds that have the property different from their constituents. They can be identified by their boiling or melting points.

    Hence, option B is correct.
  • Question 2
    1 / -0
    The dye from blue fountain pen can be separated by :
    Solution
    Fountain pen ink chromatography is when you use liquid and paper to separate out the components of another liquid, which in this case is fountain pen ink.
    The reason this happens is that as the ink moves through the paper, the different dyes that are in it move at different speeds, which causes them to separate and become visible. The dye from the blue fountain pen can be separated by chromatography. so Option C is correct.
  • Question 3
    1 / -0
    A liquid is found to scatter a beam of light but leaves no residue when passed through the filter paper. The liquid can be described as:
    Solution
    A liquid is found to scatter a beam of light (due to Tyndall effect) but leaves no residue when passed through the filter paper (as the size of the particles is smaller than the pores of the filter paper).
    The liquid can be described as a colloidal sol.
  • Question 4
    1 / -0
    Salt dissolved in water can be recovered by:
    Solution
    Salt dissolved in water cannot be separated by filtration, sedimentation or decantation because the salt will not settle down or be held back by a filter paper. We can separate salt from water by heating the mixture. The water evaporates leaving behind salt.
  • Question 5
    1 / -0
    Which one of the following is a suspension?
    Solution
    Saltwater is a solution of salt in water in which the particles do not settle own. Blood is a natural colloid, where particles do not settle down. But mud in water is a suspension as particles are large and heavy enough to settle down and separate from the solution when the solution is kept undisturbed for some time.
  • Question 6
    1 / -0
    Steel is a type of:
    Solution
    Steel is an alloy of iron and carbon. Alloys are mixtures as they are made of different elements and have a variable composition.
  • Question 7
    1 / -0
    The correct word from the given set to make the following statement true is:
    (bakelite, compound, element, oxygen, mercury, molecule) 

    ______ is a substance that contains only one type of fundamental particle.
    Solution
    An element is a substance that contains only one type of fundamental particle (atom). Hence, option C is correct. 

    Option A, 'molecules', option B, 'bakelite' and option C, 'compounds' have more than one type of fundamental particle.
  • Question 8
    1 / -0
    Fill in the blanks.

    When sugar is dissolved in water, sugar is the ______, water is the ______ and sweet water is the ______ respectively.
    Solution
    When sugar is dissolved in water, sugar is the solute, water is the solvent and sweet water is the solution respectively.

    When sugar dissolves in the water, it breaks down to provide tiny particles from its crystals. Particles of sugar pass into the gaps between the particles of water and combine to form a sugar syrup.
  • Question 9
    1 / -0
    Crude petroleum has many components that are useful. Which of the following methods is employed to separate the components?
    Solution
    Stage-wise distillation used to separate a homogeneous mixture based on the difference in boiling points of the components is called fractional distillation.
    The substances in crude oil have different boiling points, so they can be separated by fractional distillation. The crude oil is heated to about 600°C and its vapours are allowed to condense at different temperatures in the fractionating column. The temperatures in the column range from about 600°C at the bottom to 20°C at the top. Substances with high boiling points condense at the bottom, while those with low boiling points condense at the top. 
  • Question 10
    1 / -0
    Sugar dissolves in water to form sugar-water solution. Name the solute.
    Solution
    $$Solute$$: The minor component in a solution is called solute.
    $$Solvent$$: The major component in a solution is called solvent.

    Hence, in this solution, sugar is a solute and water is the solvent.

    Option A is correct.
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