Question

which gas is formed when carbon is burnt in oxygen ?which gas is formed when carbon is burnt in air ?

Answer 1

when carbon is burnt in oxygen no raction take place and when carbon is burnt in air it produces carbon dioxide

Answer 2

Carbon is most often is present in incompletely burned ashes. Carbon itself burns, combining with oxygen to make CO2 (and sometimes carbon monoxide). Charcoal production involves incomplete burning of wood, and the high-carbon product can burn further. Soot is a byproduct of fires which consists mostly of carbon, but even soot can burn, which is why it’s a good idea to sweep a chimney every so often.