Which of the following is NOT refined electrolytically?
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A.
Zinc
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B.
Iron
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C.
Copper
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D.
Silver
Correct Answer:
B. Iron
Explanation:
Electrolytic refining is a process used to purify metals by using an impure metal as the anode and a pure strip of the same metal as the cathode in an electrolyte solution containing the metal's ions. This method is highly effective for refining metals like copper, zinc, silver, and gold. However, it is not suitable for extremely reactive metals such as sodium, potassium, or iron when they are in an environment where they could react with the solvent (like water). In the provided context, iron is the metal that is typically not refined using the electrolytic method because its purification is more commonly and economically achieved through other processes like the basic oxygen process or open-hearth furnace in steelmaking. While iron can technically be deposited electrolytically, it is not the standard industrial refining method compared to the others listed.
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