ICSE Class 8 Answered

• Domestic and industrial ovens running on coal or coke or charcoal produce some carbon monoxide.
• In an oven, where there is usually free supply of air, the carbon at the lower end burns to produce carbon dioxide.
• This carbon dioxide passes through the heated layers of coke placed above in the oven, reacts with it and thus gets reduced to carbon monoxide.

      C      +     O₂    →       CO₂    +    Heat

 Carbon     Oxygen   Carbon dioxide

          CO₂        +       C        →           2CO

Carbon dioxide   Carbon     Carbon monoxide

• The carbon monoxide so produced burns with a pale blue flame at the top of the oven again forming carbon dioxide.

         2CO   +   O₂    →     2CO₂