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  4. The rust of iron is catalysed by which of the following?

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Q. The rust of iron is catalysed by which of the following?

MGIMS WardhaMGIMS Wardha 2007

Solution:

Iron is rusted in presence of oxygen and moisture. $ \underset{moisture}{\mathop{{{H}_{2}}O}}\,+\underset{air}{\mathop{C{{O}_{2}}}}\,\xrightarrow{{}}{{H}_{2}}C{{O}_{3}} $ At anode $ {{H}_{2}}C{{O}_{3}}2{{H}^{+}}+CO_{3}^{2-} $ $ Fe\xrightarrow{{}}F{{e}^{2+}}+2{{e}^{-}} $ $ 4F{{e}^{2+}}+{{O}_{2}}+4{{H}_{2}}O\xrightarrow{{}}F{{e}_{2}}{{O}_{3}}+8{{H}^{+}} $ At cathode $ {{H}^{+}}+{{e}^{-}}\xrightarrow{{}}H $ $ 4H+{{O}_{2}}\xrightarrow{{}}2{{H}_{2}}O $ Hence, rusting of iron is catalysed by hydrogen ion