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Is Matter Around Us Pure Test - 50

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Is Matter Around Us Pure Test - 50
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which of the following gas is collected at the top in fractional distillation?
    Solution
    The liquid air is allowed to warm-up slowly in a fractional distillation column, where gases get separated at different heights depending upon their boiling points. Liquid nitrogen having the boiling point of $$196^oC$$ boils to form liquid nitrogen gas and is collected from the upper part of the column.
  • Question 2
    1 / -0
    Out of the following, which gas is collected from the bottom of the fractionating column during fractional distillation of air?
    Solution
    The liquid air is allowed to warm up slowly in a fractional distillation column, where gases get separated at different heights depending upon their boiling points. The component with the highest boiling point gets collected at the bottom of the fractionating column.

    Oxygen collects at the bottom of the column as its boiling point is -183 $$^\circ C$$, whereas  Nitrogen boils at -196 $$^\circ C$$ and is collected from the top of the column. Argon boils off at -186$$^\circ C$$ and is collected from the middle of the fractionating column. 
    Hydrogen is not part of air, so it is not obtained by fractional distillation of air.
  • Question 3
    1 / -0
    The liquid air in fractional distillation method separates depending on :
    Solution
    The air is compressed by increasing the pressure and is then cooled by decreasing the temperature to get liquid air. This liquid air is allowed to warm-up slowly in a fractional distillation column, where gases get separated at different heights depending upon their boiling points.
  • Question 4
    1 / -0
    The method used to separate the volatile component(solvent) from its non-volatile solute is called:
    Solution
    We can separate the volatile component (solvent) from its non-volatile solute by the method of evaporation. The volatile component evaporates leaving behind the non-volatile component.
  • Question 5
    1 / -0
    To separate gases by fractional distillation:
    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. This liquid air is then allowed to warm up slowly in a fractional distillation column where the gases separate at different heights.
  • Question 6
    1 / -0
    In fractional distillation, the cooled and compressed air is passed through:
    Solution
    The air is compressed by increasing the pressure and is then cooled by decreasing the temperature to get liquid air. The cooled and compressed air is passed through separator. This liquid air is allowed to warm-up slowly in a fractional distillation column, where gases get separated at different heights depending upon their boiling points.
  • Question 7
    1 / -0
    In ink, _______ acts as solvent and ________ as solute.
    Solution
    The ink has water as the solvent and the dye as a solute in it. As water is present in a larger volume as compared to dye.
  • Question 8
    1 / -0
    Which of the following is a metal?
    Solution
    Sodium belongs to group I which are metallic elements while $$Cl, C$$ and $$F$$ all are non-metals.
  • Question 9
    1 / -0
    Suspension is a: 
    Solution
    $$\bf{Correct \ answer:}$$ Option $$B$$

    $$\bf{Explanation \ of \ correct \ option:}$$
    • A heterogeneous mixture is a mixture in which the composition is not uniform throughout the mixture.
    • A suspension is defined as a heterogeneous mixture in which the solid particles are spread throughout the liquid without dissolving in it.
    • In suspension, there are solid particles dispersed in the liquid solution.
    • So, Suspension is a heterogeneous mixture of two or more substances.


    $$\bf{Explanation \ of \ incorrect \ option:}$$
    • A homogeneous mixture is a mixture in which the composition is uniform throughout the mixture but suspension composition is not uniform hence it is not a homogeneous mixture.
    • The compound is made up of two or more elements and the compound is a pure substance. but the suspension is a mixture and not a pure substance.
    • 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 10
    1 / -0
    Paste is:
    Solution
    Paste is a suspension of a solid in a liquid. Granular solids are mixed with fluids to form different kinds of pastes.
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