Chemistry JAMB

Which of the following ions require the largest quantity of electricity for discharge at an electrode?

A. 4.0 moles of Cl-
B. 3.0 moles of Na+
C. 2.5 moles of Cu²+
D. 2.0 moles of Al³+

Correct Answer:

Option D = 2.0 moles of Al³+

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