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Electrolysis and Electrolytes

Which of the ...

Question

Which of the following materials could not serve as a sacrificial anode for lead?

A

Copper

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B

Iron

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C

Magnesium

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D

Manganese

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Solution

The correct option is A Copper
Copper (with positive $E^{o}$ value) is weaker reducing agent than lead (with negative $E^{o}$ value). Hence, copper cannot be more easily oxidized than lead. And therefore, copper cannot serve as sacrificial electrode for lead.

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