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Alkaline medium inhibits the rusting of iron- How??

Unlike dry cell the mercury cell has constant cell potential throughout its usefull life -- How???

For second query kindly refer to the following link
https://www.meritnation.com/ask-answer/question/why-a-mercury-cell-gives-a-standard-throught-its-life/electrochemistry/1266063 
For first query please refer to the answer given by your friends. 

 

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 Rusting of iron is due to H+ ions!! 
Hence the alkaline medium reduces the conc of H+ (While increasing the conc of OH-).. hence not falicitating the rusting of iron!! 

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The presence of OH- ions furnished by the alkaline medium removes H+ from the reaction.

2Fe+O2+4H+ = H2O+2Fe2+

and retards the oxidation of Fe to Fe2+ and inhibits the rusting of iron.

Hope it helps!:)

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alkaline medium neutralises the effect of H+ ions

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