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

Correct answer: A. Chromium

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

Explanation

Chromium forms a thin, self-repairing oxide layer on steel, protecting it from rust and corrosion. Aluminium can also resist corrosion, but it is not the defining addition in stainless steel.

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