Chapter 9 Solutions — Methods of Separation in Everyday Life

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1. 1.
   What purpose does handpicking serve in the process of separation?

   • (i) Filtration
   • (ii) Sorting
   • (iii) Evaporation
   • (iv) Decantation
2. 2.
   Which of the following substances are commonly separated using the churning method?

   • (i) Oil from water
   • (ii) Sand from water
   • (iii) Cream from milk
   • (iv) Oxygen from air
3. 3.
   Which factor is usually essential for filtration?

   • (i) Apparatus size
   • (ii) Presence of air
   • (iii) Pore size
   • (iv) Temperature of the mixture
4. 4.
   State with reason(s) whether the following statements are True [T] or False [F]. Also, correct the False statement(s).

   • (i) Salt can be separated from salt solution by keeping it under the Sun.
   • (ii) Handpicking should be used only when the quantity of one component is less.
   • (iii) A mixture of puffed rice and rice grains can be separated by threshing.
   • (iv) A mixture of mustard oil and lemon water…
5. 5.
   Match the mixtures in Column I with their method of separation in Column II. Column I:

   • (i) Gram flour mixed with black gram
   • (ii) Chalk powder mixed with water
   • (iii) Corn mixed with potatoes
   • (iv) Iron powder mixed with sawdust
   • (v) Oil mixed with water Column II:
   • (a) Handpicking
   • (b) Magnetic separation
   • (c) Decantation
   • (d) Sieving
   • (e) Filtration
6. 6.
   In what situations would you use decantation instead of filtration to separate solids from liquids?
7. 7.
   Can you relate the presence of nasal hair to any separation process?
8. 8.
   During the COVID-19 pandemic, all of us wore masks. Generally, what material are they made of? What is the role of these masks?
9. 9.
   A mixture containing potatoes, salt and sawdust has been given to you. Outline a stepwise procedure for separating each component from this mixture.
10. 10.
    Read the following story titled 'Intelligent Leela' and tick the most appropriate options. Provide a suitable title of your choice for the paragraph. Leela was working in the farm with her father when she realised that they left their drinking water at home. Before her father felt thirsty/hungry, she went to the nearby pond to fetch some water/grains. After obtaining some water in the container…