Question

Give reasons for the following.
(1)Aluminium foils are used to wrap food items
(2)Immersion rods for heating liquids are
made up of metallic substances
(3)Copper cannot displace zinc from its salt solution
(4)Sodium and potassium are stored in kerosene
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Answer 1

1. aluminium are used to wrap food item because it is soft a malleable metal and hence can't react with food
2. metal is a good conductor of heat and electricity so immersion rods for heating liquids are made up of metallic substance .
3. because copper is less reactive element than zinc.
4. Sodium and potassium are stored in kerosene oil because these metals are highly reactive in presence of air or water ,kerosene oil has no amount of water so,these metal are stored in kerosene oil.

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Answer 2

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