Question

6.
Give reasons for the following.
Mal
Aluminium foils are used to wrap food items.
(b) Immersion rods for heating liquids are made up of metallic subs
16) Copper cannot displace zinc from its salt solution.
(d) Sodium and potassium are stored in kerosene,​

Answer 1

Answer:

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Explanation:

(a)Aluminium foils are used to wrap food items because aluminium metal is malleable. Therefore, it can be beaten into thin foils. Metals are good conductors of heat and electricity.

(b)Immersion rods for heating liquids are made up of metallic substances because metals are good conductors of heat and electricity. The immersion rod needs electric supply to get heated and; in turn; to heat liquids.

(c)Copper is less reactive than zinc. Therefore, it cannot displace zinc from its salt solution.

(d)Sodium and Potassium are highly reactive metals and react vigorously with the oxygen, carbon dioxide and moisture present in the air such that it may even cause a fire. To prevent this explosive reaction, Sodium is kept immersed in kerosene because Sodium doesn't react with kerosene.