This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
Chromium added to steel does not 
Select and explain. 
A. Increase hardness, B. Increase tensile strength, C. Increase corrosion resistance, D. Decrease elastic limit
D: Decrease elastic limit
Answer: D: Decrease elastic limit 
Explanation: Chromium forms a very thin, transparent, adherent layer of Cr2O3 through a process called passivation, which provides a barrier to diffusion of oxygen and other corrosive species and it prevents further corrosion of the underlying alloy.
Ref: Phillip’s 12th edition page 127.