Aliquid used to dissolve a solid is referred to as: a catalyst a solvent an inhibitor an indicator

A solvent and an example would be water because it is polar and has the ability to dissolve many solutes, hence it is referred to as the universal solvent.

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

C) the increase in atmospheric pressure pushes the walls of the balloon outward thus making it  is the answer.hope i you.