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

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

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.

Iron does not rust when coating is broken in a galvanised iron pipe but rusting occurs if coating of tin over iron is broken. Explain.

Coating of iron with zinc is lmown as

What is the colour of rust coating on iron?