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Which of the following metal is not used as a sacrificial anode?

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Which of the following metal is not used as a sacrificial anode?

(a) Zinc

(b) Copper

(c) Magnesium

(d) Aluminium

I have been asked this question during an online exam.

This intriguing question originated from Protective Measures Against Corrosion in section Corrosion, Electrolysis, Fuel Cells and Batteries of Engineering Chemistry II

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Correct option is (b) Copper

The explanation: Zinc, aluminium, magnesium are used as a sacrificial anode. Copper is not used as a sacrificial anode.

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