Question

The metal that cannot be obtained by electrolysis of an aqueous solution of its salts is:

• A. \( \text{Ag} \)
• B. \( \text{Ca} \)
• C. \( \text{Cu} \)
• D. \( \text{Cr} \)

Hint:

Metals with highly negative reduction potentials, such as alkali and alkaline earth metals, cannot be obtained by electrolysis of aqueous solutions. These metals are usually extracted using molten salt electrolysis instead.