Select the pair that consists of a base and its conjugate acid in that order. CO32−/CO22−
H3PO4/ HPO42−
H2CO3/HCO3−
NH3/NH4+
HCO3−/CO32−
Please answer quickly.

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

Answersublimation;

The answer is ax3. hope this