Rusting of iron is catalysed by: (A) \( \mathrm{H}^{+} \)ions (B) dissolved \( \mathrm{CO}_{2} \...

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Rusting of iron is catalysed by:
(A) \( \mathrm{H}^{+} \)ions
(B) dissolved \( \mathrm{CO}_{2} \) in water
(C) \( \mathrm{O}_{2} \)
(D) impurities present
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