Question

_______ percent of earth’s crust is aluminium.

(a) 3%

(b) 25%

(c) 60%

(d) 7%

This question was addressed to me at a job interview.

This intriguing question comes from Applications and Advantages of Aluminium topic in chapter Wrought Aluminium Alloys of Aerospace Materials & Processes

Answer 1

Correct option is (d) 7%

The explanation is: Around seven percent of the earth’s crust is aluminium. Aluminium is primarily found in its ore bauxite. It is also found in several rocks, clays and soils. Aluminium is finally obtained after various types of processing.