Question

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 substan
(c) Copper cannot displace zinc from its salt solution,
(d) Sodium and potassium are stored in kerosene.​

Answer 1

★ Answer ★

(a) Aluminium foils are used to wrap food items because they are strong, lightweight, and non-toxic. They also provide a good barrier against moisture, oxygen, and light, which helps to keep the food fresh.

(b) Immersion rods for heating liquids are made up of metallic substances because they are better conductors of heat and electricity than other materials. This ensures that the liquid is heated efficiently and quickly.

(c) Copper cannot displace zinc from its salt solution because zinc is more reactive than copper and thus has a higher affinity for the salt ions in the solution.

(d) Sodium and potassium are stored in kerosene because they are highly reactive and easily oxidize when exposed to air and moisture. Kerosene is a good insulator and helps to prevent oxidation.

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CreativeAB