Which of the following will be most easily corroded in moist air?

Z n

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F e

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N i

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S n

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Solution

The correct option is B $F e$
When iron ( $F e$ ) is exposed to moist air, it reacts with oxygen to form rust.

The formation of a rust is a very complex process, which is thought to begin with the oxidation of iron to ferrous ( iron"+2") ions.

Iron metal reacts in moist air by oxidation to give a hydrated iron oxide. This does not protect the iron surface to further reaction since it flakes off, exposing more iron metal to oxidation. This process is called rusting.

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Similar questions

F e, S n, N i

F e^{2 +} + 2 e^{-} \to F e (- 0.44 V)

N i^{2 +} + 2 e^{-} \to N i (- 0.25 V)

S n^{2 +} + 2 e^{-} \to S n (- 0.14 V)

F e^{3 +} + e^{-} \to F e^{2 +} (+ 0.77 V)

Z n^{2 +} | Z n, N i^{2 +} | N i

F e^{2 +} | F e

- 0.76, - 0.23

- 0.44

X + Y^{2 +}

\to

X^{2 +} + Y

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