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Iron does not rust even if zinc coating ...

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

Text Solution

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The zinc is more reactive than iron. This means that if a crack appears on the surface of iron coated with zinc even then zinc will take part in the redox reaction and not iron. In other words, zinc will be corroded in surface to iron. But same is not is the case with tin it is less reactive than iron. if a crack appears on the surface of iron coated with tin, then iron will take part in the redox reaction and not tin. Therefore, iron will be corroded under these circumstances.
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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
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    D
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  • When a copper vessel is exposed to moist air for a long time, it acquires a dull green coating on its surface. The material of this green coating is a mixture of:

    A
    Copper oxide and copper sulphate
    B
    Copper carbonate and copper hydroxide
    C
    Copper oxide and copper carbonate
    D
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