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Prevention of Corrosion

ntIf Zinc is ...

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ntIf Zinc is placed above Iron in the reactivity series of metals. Then, why doesn't the zinc coating on an iron object react and corrode faster than an iron object without any zinc coating ?n

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Q. If zinc coating is removed after galvanisation, the iron article does not corrode. Why.

E^{o}

values of three metals are listed given.

Z n_{(a q)}^{2 +} + 2 e^{-} \to Z n_{(s)};

E^{o} = - 0.76

V

F e_{(a q)}^{2 +} + 2 e^{-} \to 2 F e_{(s)};

E^{o} = - 0.44

V

S n_{(a q)}^{2 +} + 2 e^{-} \to S n_{(S)};

E^{o} = - 0.14

V
Which of the following statements are correct on the basis of the given 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.

Why zinc coating is used in iron bridges?

Q. Name the process of depositing a layer of zinc on iron. Give two examples of objects on which zinc coating is done.

Q. Why do iron bridges use zinc coating?

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