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Factors Affecting Corrosion

In order to p...

Question

In order to pevent corrosion why are metals coated with more reactive metals and not with less reactive metals. More reactive metals will react more with gases in the air and corrode more. Example - Iron is coated with Zinc.

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Solution

The more reactive metals will react with the gases, moisture etc. themselves but will protect the precious metal from corrosion.

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Q. Statement I: In electroplating, a superior metal is coated with an inferior metal.
Statement II: When iron is coated with zinc metal, iron becomes more resistant to corrosion.

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

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

E^{o} = - 0.14

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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.

Q. Find out more reactive metals and less reactive metals?

Q. Question 4
Food cans are coated with tin and not with zinc because:
a) Zinc is costlier than tin
b) Zinc has a higher melting point than tin
c) Zinc is more reactive than tin
d) Zinc is less reactive than tin

X

does not react with cold water but reacts with hot water to form its hydroxide.Metal

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is more reactive than iron but less reactive than sodium.
Metal

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Factors Affecting Corrosion

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