Which statement about aluminum is true?

• A. Aluminum can be used as a coating for different metals.
• B. Aluminum cannot be used as a coating for any metal.
• C. Aluminum coatings are always brittle.
• D. Aluminum is heavier than lead.

Answer: (A)

Aluminum coatings are a practical way to protect different metals from corrosion by forming a protective barrier and oxide layer. This is why it’s common to see aluminum applied to metals like steel or copper through methods such as aluminizing or cladding, giving the underlying metal improved corrosion resistance without sacrificing strength. So the statement that aluminum can be used as a coating for different metals is true. It isn’t accurate to say aluminum cannot be used as a coating, nor that aluminum coatings are always brittle. And aluminum is lighter, not heavier, than lead, since aluminum’s density is about 2.7 g/cm³ while lead’s is about 11.3 g/cm³.