InterviewSolution
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InterviewSolution
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Observe the following picture write down the chemical reaction with expanation. |
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Answer» In the above diagram, process of rusting takes place. (ii) A certain type of raddish coloured solid layer collects on the metallic surface. (iii) This layer is called rust. (iv) Its chemical formula is `Fe_(2)O_(3). xH_(2)O.` The rust is formed by an electrochemical reaction. (v) Different regions on the surface of iron become anode and cathode. (vi) Fe is oxidised to `Fe ^(2+)` in hte anode region . `Fe_((s))to Fe_((aq))^(2+)+2e^(-)` (vii) `O_(2)` reduces to form water in the cathofe region. `O_(2(g))+4H_((aq))^(+) +4e^(-) to 2H_(2)O_((l))` When `Fe^(2+)` ions migrate from the anode region, they react with water and further get oxidised to from `Fe^(3+)` ions. (viii) A reddish coloured hydrate oxide is formed from `Fe^(3+)` ions, it is called rust. It collects on teh surface. (ix) `2F_((aq))^(3+) +4H_(2)O_((l))to Fe_(2) O_(3). H_(2)O_((s)) +6H_((aq))^(+).` (x) Due to various components of atmosphere, oxidation of matals takes place, concequently resulting in their damage. (xi) This is called Corrosion Iron rusts and a raddish coloured layer is collected on it. This is corrosion of iron. |
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