Question

Corrosion is a chemical reaction that involves :

• A. The inside of the object changing from an element to a compound
• B. The surface of the object changing from an element to a compound
• C. Nothing happens
• D. The surface of the object changes from one element into another element

Answer 1

The correct option is B The surface of the object changing from an element to a compound

Corrosion is a natural process, which converts a refined metal to a more chemically stable form, such as its oxide, hydroxide, or sulfide.

The corrosion process is achemical change because two substances react together to form a new substance.

When iron rusts, iron molecules react with oxygen molecules to make a compound called iron oxide.

The surface of an object is changing from an element to any compound such as oxide, hydroxide, sulfide etc.

Option $B$ is correct.