Question

Q9 (a) Why do we paint objects made up of iron ?

(b) why is nitrogen gas filled in food packets containing oil and fats ?

(c) which processes are responsible for (a) and (b) ?​

Answer 1

Answer:

(a) Iron articles are therefore painted off so that iron can not react with water and air. ... This is the way to avoid a reaction which would concurrently stop rusting of iron.

(b) Nitrogen is an inert gas and does not easily react with these substances. ... Thus, bags used in packing food items are flushed with nitrogen gas to remove oxygen inside the pack. When oxygen is not present inside the pack, rancidity of oil and fat containing food items is avoided.

Answer 2

Answer:

(a) because it become rusted and it will react with water and air .

(b) to prevent them to contact with oxygen.