Question

All of the following are true for aluminum except that:

• A. it is a good conductor of electricity
• B. it is a metal of high density
• C. it forms a protective coating in air that resists further corrosion
• D. it is an excellent reducing agent
• E. it forms a hydroxide that that is soluble in both strong base and acid

Answer 1

Answer: (B)

it is a metal of high density

The properties of aluminium include low density and therefore low weight, high strength, superior malleability, easy machining, excellent corrosion resistance and good thermal and electrical conductivity.
The surface of aluminum metal is covered with a thin layer of oxide that helps protect the metal from attack by air. So, normally, aluminum metal does not react with air. Aluminium hydroxide is amphoteric in nature. Hence, it dissolves in both acidic and basic solution.