Carbon is a building block of all life and is an element that naturally occurs on this planet. There is the same volume of carbon on the planet today as their was millions of years ago.
Carbon is a good reducing agent it reduces the oxide into pure metal, Fe2O3 + 3C = 2Fe + 3CO
I belive its Cu2O but im not sure
It depends on which Carbon oxide you are using. For example Carbon dioxide produces Carbonic acid while Carbon monoxide produces Formic acid.
Formula is C3O2, structure is: O=C=C=C=O