Question

The slow conversion of wood into coal by a biochemical process extending over millions of years is called as ___________.

• A. catenation
• B. coal mining
• C. destructive distillation
• D. carbonization

Answer 1

The correct option is D carbonization

Coal is formed by burying huge forests under the surface of Earth in hot and humid conditions. This progressively removes hydrogen and oxygen, leaving behind carbon. Due to very high temperature and pressure on Earth, the carbon became compact to form stony residue called coal. This process of converting wood into coal is called as carbonization. The process of heating a substance in absence of air is known as destructive distillation. Catenation is the unique property of carbon to form long chains. Coal mining is the process of extracting coal.