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Question

State whether the following statements are true or false.​

(a) A mixture of oil and water can be separated by filtration. ​
(b) Water can be separated from salt by evaporation.
(c) A mixture of wheat grains and wheat flour can be separated by sieving.
(d) A mixture of iron filings and rice flour can be separated by a magnet.
(e) A mixture of wheat grains and rice flakes can be separated by winnowing.
(f) A mixture of tea leaves and milk can be separated by decantation.​

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Solution

(a)
A mixture of oil and water can be separated by decantation, and cannot be separated by filtration, as both of them are liquids.​

Hence, the given statement is false.​

(b)
Process of conversion of water to its vapour is called evaporation. It can be used to separate water from salt.​

Hence, the given statement is true​

​(c)
Sieving is used to separate those solid mixtures which have components of different sizes. Wheat flour and wheat grains have different sizes.​

Hence, the given statement is true.​

(d)
Iron fillings get attracted to the magnets, while rice flour is non-magnetic in nature, and do not get attracted by magnets. So, we can use magnets to separate iron fillings from rice flour.​

Hence, the given statement is true. ​

(e)
Winnowing is used to separate heavier and lighter components of a mixture by wind or by blowing air. We can separate wheat grains and rice flakes by this method.​

Hence, the given statement is true.​

(f)
Decantation is the process of pouring out the liquid without disturbing the sediment, that has settled at the bottom.Tea leaves and milk can be separated by this method.​

Hence, the given statement is true. ​


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