What is the chemical formula of rust?

Oil and fat containing food items are flushed with nitrogen. Why?

The coating formed on the metals such as iron, silver, and copper after corrosion will be:

Which of the following gases can be used for the storage of a fresh sample of an oil for a long time?

Write true or false for the following statement:
Due to corrosion, iron gets a brown coating, copper gets a green coating, and silver gets a black coating.

If copper is kept open in air,it slowly loses its shining brown surface and gains a green coating. It is due to the formation of