Cations A. are charged ions which move toward the cathode of a galvanic or electrolysis cell. B. are charged ions which move toward the south pole of a magnetic field. C. are charged ions which move toward the positive electrode of an electrolysis cell. D. are ions which attach themselves to any electrode to react chemically during electrolysis. E. are negatively charged ions which result from electrical discharge in a liquid solution.

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na