Select the correct Chemical formula of corundum from the given options.

• A. Al₂O₃.2H₂O
• B. SiC
• C. Al₂O₃.H₂O
• D. Al₂O₃

The correct chemical formula for corundum is Al₂O₃.

Understanding Corundum

Corundum is a crystalline form of aluminum oxide and is known for its hardness. It is commonly found in gemstones such as sapphires and rubies.

Why Other Options Are Incorrect

• A. Al₂O₃.2H₂O: This represents a hydrated form of aluminum oxide, not corundum.
• B. SiC: This is silicon carbide, a different compound entirely.
• C. Al₂O₃.H₂O: This indicates a monohydrate form, which is also not corundum.

In summary, the only correct formula for corundum is Al₂O₃.