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Give reasons for the following. (a) Al...

Give reasons for the following.
(a) Aluminium foils are used to wrap food items.
(b) Immersion rods for heating liquids are made up of metallic substances.
(c) Copper cannot displace zinc from its salt solution.
(d) Sodium is stored in kerosene.

Text Solution

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(a) Aluminium is metal (i.e., malleable), soft and does not react with food materials. Therefore, aluminium foils are used to wrap food items.
(b) Metals are good conductor of heta and electricity. So, immersion rods are made of metallic substances.
(c) Copper is less reactive than zinc. therefore, copper cannot displace zinc from its salt solution.
(d) Sodium react most vigorously with the oxygen in air to form their oxides. therefore, sodium is stored in kerosene.
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