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Question

Zinc is used to protect iron from corrosion because:


A
Ered of Zn<Ered of iron
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B
Eoxidation of Zn<Eoxidation of iron
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C
Eoxidation of Zn=Eoxidation of iron
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D
zinc is cheaper than iron
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Solution

The correct option is A $$E_{red}$$ of $$Zn < E_{red}$$ of iron
Zinc is used to protect iron from corrosion because it is more active metal than iron and it has more tendency to lose electrons with respect to iron. In other words, zinc has a negative reduction potential higher than that of iron.

$$E^o_{zn^{2+}| Zn}=-0.76\ V$$

$$E^o_{Fe^{2+}| Fe}=-0.44\ V$$

Chemistry

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