Which of the following elements is sometimes used to protect iron ?

Options

A. Cu
B. Pt
C. Ni
D. Pd

Answer

C

Explanation

Nickel is a silvery white metal that is quite unreactive. In fact, Ni plating is sometimes used to protect iron. Group 10 consist of elements-nickel, palladioum, platinum and darmstadtium. In the bulk state none of thes is eractive and indeed are resistant to atmospheric corrosion at normal temperatures. Ni and Pd react on hating with centain nonmetals such as halogens. However, the reactivity falls from Ni through Pd tyo Pt. The oxidation state of `+2` is important for Ni and Pd but four Pt both the `+2` and `+4` oxidation states are equally important. Nickel is well known as an alloying metal, e.g., nichrome (`60%` Ni, `40%` Cr) and german silver `(Cu 25 - `30%`, Zn 25 - `30%` and Ni 40 - `50%`). Most extensive uses of Pd and Pt are as catalysts.