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InterviewSolution
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Give reasons for the following.(a) Aluminium foils are used to wrap food items.(b) Immersion rods for heating liquids are made up of(c) Copper cannot displace zinc from its salt soluticoSodium and potassium are stored in kerosene. |
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Answer» Aluminium foils are used to wrap food items because aluminium being a soft malleable metal it can be beaten to in sheets to form thin wrapping sheets. Moreover it does not react with food items. Immersion rods are made of metallic substances metals are good conductors of heat and electricity. They get hot very soon when electric current is passed through them and thus warm the water. Copper can not displace zinc from its salt-solution because copper is less reactive than zinc. A less reactive metal can not displace more reactive metal from its solution. Sodium and Potassium are stored in Kerosene since they are very reactive. They quickly react in air and water. |
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