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http://pmt.physicsandmathstutor.com/...Potentials.pdf

Question 4i.
Can I say that chromium metals from complex ions or coloured ions?

I don't understand the markscheme's answer:

Stainless steel + corrosion resistance or alloys for tools + hardness or other named alloy/use/property 1 Allow chrome plating with attractive or barrier to corrosion
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