What choice is not a characteristic of a catalyst?

Catalysts do not change the final result of a reaction. They, themselves, are not changed, and they can change the nature of the reaction. In addition, they can also speed up or slow down the rate of the reaction, but they will not have an effect on the reaction's outcome.

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