Give reasons for the following.
(a) Aluminium foils are used to wrap food itens.
(b) Immersion rods for heating liquids are made up of metallic substances.
(c) Copper cannot displace zinc from its salt solution.
(d) Sodium and potassium are stored in kerosene.
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Answer:
a) Aluminium is malleable and doesn't react with food so, it can be used for wrapping food.
b)Metals are good conductors of heat and so immersion rods are made metals to conduct heat to the liquids.
c)Copper is less reactive than Zinc so it can't displace zinc from its compound.
d)Sodium and Potassium are highly reactive metals and if kept in open, the may react with atmoshpheric oxygen and catch fire. To prevent accidental fires, they are stored in kerosene oil.
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