NEET UG CHEMISTRY MCQ: ELECTRO CHEMISTRY

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Understanding +4 | -1

Which of the following statement(s) is/an incorrect for corrosion of iron?

(i) Reaction occurring at anode is

{O}_2(g)+4 {H}^{+}(a q)+4 e^{-} \rightarrow 2 {H}_2 {O}(\ell)

(ii) Reaction occurring at cathode is

2 {Fe}({s}) \rightarrow 2 {Fe}^{2+}+4 e^{-}

(iii) Rust is

{Fe}_2 {O}_3 \cdot {H}_2 {O}

(iv)

{H}^{+}

involved in corrosion reaction is provided from

{H}_2 {CO}_3

which is formed due to dissolution of carbon dioxide from air in to water.

View answer and explanation

Correct option: C

(i) and (ii)

Option C ((i) and (ii)) is correct because the reaction at the anode is the oxidation of Fe to

Fe^{2+}

, and the reaction at the cathode is the reduction of

O_2

H_2O

. The given reactions are reversed.

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