Which of the following corrosion contaminant will act as a protective layer?

Which of the following corrosion contaminant will act as a protective layer? Correct Answer AgCl

Silver on reaction with chlorine forms silver chloride. It acts as a protective layer and prevents chlorine to corrode further. Here SnCl2 and CaO are volatile in nature whereas Fe2O3 is porous in nature. Hence, they can’t act as protective layers.
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