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Which of the following statement(s) is/ are incorrect for corrosion of iron?
(i) Reaction occurring at anode is
\[
\mathrm{O}_{2}(\mathrm{~g})+4 \mathrm{H}^{+}(\mathrm{aq})+4 \mathrm{e}^{-} \longrightarrow 2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})
\]
(ii) Reaction occurring at cathode is
\[
2 \mathrm{Fe}(\mathrm{s}) \longrightarrow 2 \mathrm{Fe}^{2+}+4 \mathrm{e}^{-}
\]
(iii) Rust is \( \mathrm{Fe}_{2} \mathrm{O}_{3} \cdot \mathrm{xH}_{2} \mathrm{O} \)
(iv) \( \mathrm{H}^{+} \)involved in corrosion reaction is provided from \( \mathrm{H}_{2} \mathrm{CO}_{3} \) which is formed due to dissolution of carbon dioxide from air in to water.
(a) (iv) only
(b) (i) only
(c) (i) and (ii)
(d) (i), (ii) and (iv)
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