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Doctors Medicines MCQs Q&A

  1. It is a true solution.
  2. Its solute particles will settle down on keeping undisturbed.
  3. Its solute particles can be seen with naked eyes.
  4. It will scatter light.
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1 Answers

Option 4 : It will scatter light.

The correct answer is It will scatter light.

Concept:

Mixtures:

  • A mixture is a substance that consists of two or more elements or compounds not chemically combined together

Types of Mixtures:

  • Homogeneous Mixture:
    • Those mixtures, in which the substances are completely mixed together and are indistinguishable from one another, are called homogeneous mixtures.
    • A true solution is a homogeneous mixture. 
    • For example Soda water, Soft drinks, lemonade, salt or sugar solution, etc.
  • Heterogeneous Mixture:
    • Those mixtures in which the substances remain separate and one substance is spread throughout the other substance as small particles, droplets, or bubbles are called heterogeneous mixtures.
    • All the suspensions and colloids are heterogeneous mixtures.
    • For Example: - Sugar and sand mixture, muddy river water, soap solution. 

Explanation:

Colloids:

  • These mixtures appear to be homogeneous but they are actually heterogeneous. 
  • Their particles are very small (1-to 1000 nanometers in size). They cannot be seen with naked eyes. 
  • They show the Tyndall effect i.e., they scatter the beam of light passing through them. 
  • They don’t settle down when left undisturbed for some time. They are quite stable. 
  • They cannot be separated by the filtration process but they can be separated by centrifugation.

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