A) Fe and Pt
B) Fe and Zn
C) Fe, Ag and Pt
D) Pb, Ag and Pt
Correct Answer: A
Solution :
When iron is treated with cone. \[HN{{O}_{3}},\]it becomes passive because of the formation of a protective layer of \[\text{FeO}\bullet \text{F}{{\text{e}}_{\text{2}}}{{\text{O}}_{\text{3}}}\]on the surface. On the other hand, Pt being a noble metal does not react with conc.\[\text{HN}{{\text{O}}_{\text{3}}}\].
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