Given the equation representing a reaction at equilibrium: n₂ + 3h₂ ⇄ 2nh₃ what occurs when the concentration of h₂ is increased

That would cause the equation to shift right, and make more NH3 and decrease the amount of N2

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