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Why does not iron rust even if zinc coat...

Why does not iron rust even if zinc coating is broken in a galvanised iron pipe ?

Text Solution

Verified by Experts

Zinc being more reactive than iron will sacrifice itself for the sake of iron. As a result, zinc will participate in the corrosion while iron will remain intact. For more details, consult Section 23.
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Iron does not rust even if the zinc coating is broken in a galvanised iron pipe but rusting occurs much faster if the tin coating over iron is broken. Explain.

Iron does not rust even if zinc coating on its surface is broken but the same is not true when coating is of tin.

Knowledge Check

  • E^(0) values of three metals are listed below . Zn_((aq))^(2+)+2e^(-) to Zn_((s)), E^(0) = -0.76 V Fe_((aq))^(2+)+2e^(-) to 2Fe_((s)) , E^(0) = -0.44 V Sn_((aq))^(2+) +2e^(-) to Sn_((s)) , E^(0) = -0.14 V Which of the following statements are correct on the basis of the above information ? (i) Zinc will be corroded in preference to iron if zinc coating is broken on the surface. (ii) If iron is coated with tin and the coating is broken on the surface then iron will be corroded. (iii) Zinc is more reactive than iron but tin is less reactive than iron.

    A
    (i) and (ii)
    B
    (ii) and (iii)
    C
    (i),(ii), and (iii)
    D
    (i) and (iii)

  • E^@ values of three metals are listed below. {:(Zn_((aq))^(2+) + 2e^(-) to Zn_((s)),, E^@=-0.76V),(Fe_((aq))^(2+) + 2e^(-) to 2Fe(s) , , E^@=-0.44 V),(Sn_((aq))^(2+)+2e^(-) to Sn_((s)) ,, E^@=-0.14 V) :} Which of the following statements are correct on the basis of the above information ? (i)Zinc will be corroded in preference to iron if zinc coating is broken on the surface. (ii)If iron is coated with tin and the coating is broken on the surface then iron will be corroded . (iii)Zinc is more reactive than iron but tin is less reactive then iron.

    A
    (i) and (ii) only
    B
    (ii)and (iii) only
    C
    (i),(ii) and (iii)
    D
    (i) and (iii) only

  • Iron is galvanised when it is dipped in

    A
    molten zinc
    B
    molten copper
    C
    molten carbon
    D
    molten gold.

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    Why is iron galvanised with zinc ? Can it be galvanised with copper ? If not, why ?

    Why are tin coated iron cans used for cool drinks but not galvanized iron cans? Explain.

    How does galvanisation of iron protect iron from rusting even when protective zinc coating is partially worn away ?

    Rusting of iron is

    In which process is a protective zinc coating applied on iron to prevent it from rusting?

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