SSC MTS EXAM

Detailed explanation-1: -The burning of wood is a chemical change as it leads to the formation of new substances like Carbon dioxide gas, water vapour, ash, etc. There are some substances that do not undergo complete combustion or do not react at all, these substances form the fire ash.

Detailed explanation-2: -It is chemical change as ash is formed in the process which is new compound and oxides of carbon are also released during the process. By the definition of chemical change, we come to know that during chemical change a new substance must form. These changes are irreversible in nature. Was this answer helpful?

Detailed explanation-3: -Answer should be irreversible. When wood is burnt a new substance is formed which cannot be reversed.

Detailed explanation-4: -The burning of paper and wood is known as an example of a chemical change. Because here, on heating paper or wood, ash is obtained which has a different chemical composition than that of paper or wood. Also, the process is irreversible as we can’t obtain paper again from ash.