Question

Here’s the question :

Answer 1

Undergone a chemical change

Step-by-step explanation:

When a metal rusts, it has undergone a chemical change because : -

1. Reddish brown appearance on the metal.
2. Metal will become brittle, fragile, progressive.

Moisture has air, water and acid ( chemicals ), which react with metal to form rust, hence it undergone a chemical change.

Answer 2

The answer is b because it goes through a chemical reaction called oxidation. Therefore leading it to rust.