Answer:
B) Chemical
Step-by-step explanation:
Yes, a chemical reaction occurs when metals are exposed to moist air. This process is called corrosion. Corrosion occurs when metals react with oxygen and moisture in the air. For example, when iron is exposed to moist air, it reacts with oxygen to form rust (Fe2O3). Copper also reacts with gases, moisture, and atmospheric gases to form a copper carbonate and hydroxide mixture. This mixture gives the surface of copper a green color.