In which of the following process a chemical reaction has taken place? 1. Ice melts into water 2. A wet shirt got dried in sunlight 3. A brown layer is formed over iron rod kept in air 4. sugar getting dissolved in water
Answers
Answer:
3.
Explanation:
A brown layer is formed over iron kept in air because Water present in air reacts with iron and forms a rusty substance called iron oxide
Answer:
The answer is 3. A brown layer is formed over an iron rod kept in the air
Explanation:
Option 3 is an example of a chemical change.
A chemical change results in the formation of a new substance, and it is an irreversible process. When an iron rod is exposed to air, a brown film forms on top of it owing to corrosion.
The reason why others are incorrect is that they are examples of physical change.
A reversible change in properties such as texture, shape, or state is referred to as a physical change. Considering the transformation of ice into water, there is no formation of a new substance. when water is placed at a lower temperature it again changes to ice. A physical change does not result in the formation of new material.