Iron can be protected by coating with zinc or tin. If coating is broken.
Iron can be protected by coating with zinc or tin. If coating is broken.
A. iron will corrode faster if coated with zinc
B. iron will corrode faster if coated with tin
C. iron will corrode faster in both cases
D. iron will not undergo any corrosion in both cases.
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Correct Answer - B
If coating is broken , iron will corrode faster if coated with tin . This is because their standard oxidation potentials are :
` E_(Zn|Z^(2+))^(@) = + 0.76 V , E_(Fe|Fe^(2+))^(@) = +0.44` V
`E_(Sn| Sn^(2+))^(@) = +0.14 V ` .
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