D. Answer the following questions in brief. 1. Name any three methods used for separating a solid-solid mixture. 2. What is winnowing? Give an example of a mixture whose components can be separated by this method. 3. Some iron pins get scattered on the carpet when you are expecting guests. How can one collect all the pins in the shortest possible time? 4. Name any three substances which sublime on heating. 5. What is crystallisation? Name any three substances which can be purified using this technique. 67
Answers
Answer:
1.Name any three methods used for separating a solid solid mixture Ans-hand picking, threshing, sublimation.
2.Winnowing is the simple method of cleaning food materials from a mixture. Winnowing separate the grain from the husk because one particle is light and the other is heavy . ... This is process is known as winnowing. Examples are paddy (rice) and wheat .
3.With the help of Magnet we can collect all the pins from the carpet. Pins are made up of iron metals and we know that iron have the property of Magnetism. ... As we bring magnet near the pins, end of the pins attach with the magnet, there fore this is the best and the easiest way to collect all the pins.
4.Camphor, ammonium chloride and iodine are examples of substances which sublime on heating.
5.Potash alum, tetraamine copper sulphate, washing soda are purified by crystallization. Explanation: Crystallisation is a very popular technique to separate a solute from a solvent. In this process the solution is heated in which the water of crystallization gets evaporated.
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