If the pOH of a solution is 2, what is the concentration of H+ ions in that solution?

POH + pH = 14
pH = 14 - 2 = 12
[H+] = 10^-pH = 10^-12

[H+] = 1 • 10^-12 M

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