Question

How many compounds can be formed when carbon combines with oxygen?

• A. 4
• B. 1
• C. 2
• D. 3

Answer 1

Answer: (A)

When carbon combines with oxygen, we may get four oxo carbons or oxides of carbon which are:
Carbon monoxide $\to CO$
Carbon dioxide $\to C{O}_2$
Carbon suboxide $\to C_3{O}_2$
Mellitic anhydride $\to C_{12}{O}_9$