Aluminium foil is used for wrapping food because

Asked by admin @ 31/08/2021 in Science viewed by 348 People

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 and potassium are stored in kerosene.

Answered by admin @ 31/08/2021

A) Aluminium is the least reactive metals so it does not react with food items and does not alter the taste. Moreover, being a metal ; aluminium is highly malleable and can be made into very thin foils which are perfect for wrapping.
b) Immersion rods are for hearing liquids are made up of metallic substances beecause metals are good conductors of heat and electricity. The immersion rod needs electric supply to get heated and ; in turn ; to liquids.
c) Copper is less reactive than zinc. This is the reason copper cannot displace zinc from its salt solution.
d) Sodium and pottasium are highly reactive metals. If kept in open they readily react with oxygen in the atmosphere. The reaction is so quick and the sodium and pottasium easily catch fire. To prevent accidental fire, they are stored in kerosene....
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Aluminium foil is used for wrapping food because

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