Question

In which of the following process, chemical change occurs?
1)evaporation
2)burning
3)moisturisation
4)boiling

Answer 1

Evaporation............................

Answer 2

Burning – is the process in which a chemical change occurs.
 
Chemical Change is a process in which a substance combines with another to form a new substance by chemical reactions.
 
In the above given process, new products are formed after a chemical reaction in which the products are reversible.
 
However, in burning, a new substance is formed which is irreversible.
 
Example: Ash is formed after burning wood, Carbon dioxide and water are formed after burning methane gas in air, etc.