Answer: Option C : C Mond’s / Carbonyl process is a technique created by Ludwig Mond in 1890 to extract and purify Nickel. NiO(s)+H2200∘C−−−−→Ni(s)+H2O(g) (Impurities) Ni(s)+4CO(g)50−60∘C−−−−−→Ni(CO)4(g) (impurities) Ni(CO)4(g)220−250∘C−−−−−−−→Ni(s)+4CO(g)
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