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

Question 2. Can you store the lemon pickle in an aluminium utensil? Explain.​

Answer 1

Answer:

(a) The material used in wrapping food items should be flexible, foldable and non-reactive with the food. Aluminum is a soft and malleable metal. It can be easily beaten into thin sheets to form wrapping foils. Also, aluminum does not react with food items.

(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. ... Sodium and potassium are highly reactive metals.

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.

answer2.The lemon pickle contains acids. Metals like aluminum readily react with acid to liberate hydrogen gas. This can lead to spoiling of the pickle.

Answer 2

ANSWER:-

No.

EXPLANATION :-

We can't store the lemon pickle in aluminium utensil because aluminium is metal and lemon is acid.

The acids react with aluminium to release hydrogen which would spoil the food and rented it unfit for use.