Question

Corrosion of metals involves

a. physical reactions

b. chemical reaction

c. both physical and chemical reactions

d. none of the above

Answer 1

it involves chemical reaction as we can't get
the original metal once it's corroded...

Answer 2

Answer: Option (b) is the correct answer.

Explanation:

A reaction in which no chemical change occurs in the molecules of the substance is known as a physical change.

For example, mass, density, volume etc are physical changes.

Whereas a reaction in which a chemical change occurs between the molecules of a substance is known as a chemical change. A chemical change results in the formation of a new compound.

For example, combustion, toxicity etc are chemical changes.

Also, rusting of iron is a chemical change as a new product is formed in this process.

Thus, we can conclude that corrosion of metals involves chemical reaction.