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Question

Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because :


A
zinc has lower negative electrode potential than iron
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B
zinc has higher negative electrode potential than iron
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C
zinc is lighter than iron
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D
zinc has lower melting point than iron
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Solution

The correct option is B zinc has higher negative electrode potential than iron
$$E^0_{Zn^{2+} | Zn} =\ – 0.76\ V$$
$$E^0_{Fe^{2+} | Fe} =\ – 0.44\ V$$
Zn has higher negative SRP (Standard reduction potential) so it works as anode and protects iron to make iron as the cathode.
Hence, option $$B$$ is correct.

Chemistry

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