Flash Education

Question

A mixture of iron nails, salt, oil and water is provided to you. Give stepwise methods to separate each component from this mixture.

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Answer

(i) Iron nails are separated from the mixture by handpicking.

(ii) The mixture is allowed to stand for some time. Two separate layers will be formed. The top layer of oil is decanted to separate it from the mixture.

(iii) Pour this liquid into a kettle, close its lid and heat it. Now take a metal plate with some ice on it and hold this plate just above the spout of the kettle. The steam coming out condenses when comes in contact with the metal plate and forms water and salt is left behind.

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Read the story titled “WISE FARMER” and tick the correct option to complete the story. A farmer was i. sad/happy to see his healthy wheat crop ready for harvest. He harvested the crops and left it under the ii. Sun/rain to dry the stalks. To separate the seeds from the bundles of the stalk he iii. handpicked/threshed them. After gathering the seed grains, he wanted to separate the stones and husk from it. His wife iv. winnowed/threshed them to separate the husk and later v. sieved/handpicked to remove stones from it. She ground the wheat grains and vi. sieved/filtered the flour. The wise farmer and his wife got a good price for the flour.

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