Question

17.A shiny brown coloured element X on heating in air becomes black in color
Name the element X and the black coloured compound formed.
18. Why do we apply paint on iron articles?
19. Oil and fat containing food items are flushed with nitrogen. Why?
20. Explain the following terms with one example each.
(a) Corrosion
(b) Rancidity​

Answer 1

Explanation:

1.copper is the element and black coloured element is cuo

2.to protect irpn articles from rust

3.because in contact with air the food gets rancid

4.the eating up of the metal by the action of air is called corrosion

the process in which fats get oxidised is rancidity

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Answer 2

Answer:

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