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 Eo value) is weaker reducing agent than lead (with negative Eo value). Hence, copper cannot be more easily oxidized than lead. And therefore, copper cannot serve as sacrificial electrode for lead.