38. Describe how common salt is obtained from sea-water. 39. Why do we need to separate different components of a mixture ? Explain with examples. 40. Name a solid, a liquid and a gaseous mixture. How will you separate a mixture of sugar and sand ? 41. (a) What is a saturated solution ? Explain with an example. (b) What will happen if the saturated solution of a substance in water is (i) heated, and (ii) cooled?

38. Describe how common salt is obtained from sea-water. 39. Why do we

1.	38. Describe how common salt is obtained from sea-water. 39. Why do we need to separate different components of a mixture ? Explain with examples. 40. Name a solid, a liquid and a gaseous mixture. How will you separate a mixture of sugar and sand ? 41. (a) What is a saturated solution ? Explain with an example. (b) What will happen if the saturated solution of a substance in water is (i) heated, and (ii) cooled?
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