Correct option is A
Correct Answer: A. Chromium
Information Booster
Chromium is the key element added to steel to form stainless steel.
It forms a thin, invisible layer of chromium oxide on the surface, which prevents further oxidation (rusting).
To be classified as stainless steel, the steel must contain at least 10.5% chromium.
Additional Information
Aluminium: Used in light-weight alloys, not for rust resistance in steel.
Carbon: Present in steel to increase hardness and strength, but does not prevent rust.
Copper: Slightly improves corrosion resistance, but not effective alone in making steel rust-resistant.
Stainless steel is widely used in:
Cutlery and kitchenware
Medical instruments
Construction and architecture
Automotive and aerospace parts
English
100 Questions
100 Marks
90 Mins
