Assertion A Aluminium and its alloys are vital to the aerospace industry and important in transporta...........

Science Affairs Chemistry

Assertion (A): Aluminium and its alloys are vital to the aerospace industry and important in transportation and building industries, such as building facades and window frames.

Reason (R): Aluminium is remarkable for its low density and its ability to resist corrosion through the phenomenon of passivation.

Both (A) and (R) are true and (R) is the correct explanation of (A).

Both (A) and (R) are true but (R) is not the correct explanation of (A).

(A) is true but (R) is false.

(A) is false but (R) is true.

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Explanation:

By mass, aluminium makes up about 8% of the Earth's crust; it is the third most abundant element after oxygen and silicon and the most abundant metal in the crust, though it is less common in the mantle below. The chief ore of aluminium is bauxite. Aluminium metal is so chemically reactive that native specimens are rare and limited to extreme reducing environments.