Explain the occurrence of carbon

Carbon occurs in nature in free state as well as in combined state.

  1. Free state: Diamond , Graphite , Coal
  2. Combined state :
    Gaseous state: 1) In the atmosphere, 2) As a natural gas and petroleum gas
    Liquid state: 1) Natural waters - Soluble carbonates and bicarbonates
    Solid state: 1) In wood (cellulose)
  3. Mineral deposits of metallic carbonates