A) dry air
B) air and water
C) distilled water and carbon dioxide
D) oxygen and carbon dioxide
Correct Answer: B
Solution :
\[C{{O}_{2}}\] present in air, on reacting with water gives carbonic acid. \[2{{H}_{2}}C{{O}_{3}}2{{H}^{+}}+2HCO_{3}^{-}\] \[Fe\xrightarrow{{}}F{{e}^{2+}}+2{{e}^{-}}\] \[2{{H}^{+}}+2{{e}^{-}}\xrightarrow{{}}{{H}_{2}}(gas)\] \[{{H}_{2}}+\frac{1}{2}{{O}_{2}}\xrightarrow{{}}{{H}_{2}}O\] Rusting of iron is an electrochemical reaction. In this reaction oxidation of iron and reduction of \[{{O}_{2}}\] takes place.
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