Which metal is added to steel to make it stainless steel?

A. Chromium
B. Aluminium
C. Carbon
D. Copper

Check Answer

The correct answer is A) Chromium.

Chromium is added to steel to make it stainless steel. Stainless steel is a type of steel that contains at least 10.5% chromium by mass, as well as other elements such as nickel, manganese, and nitrogen. The chromium in stainless steel forms a thin layer of oxide on the surface of the steel, which helps to prevent corrosion and staining. Aluminium, carbon, and copper are not typically added to steel to make it stainless steel.
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