Which of the following reactions is an example of an ion-exchange reaction that goes to completion?
NaCl + KNO₃ → NaNO₃ + KCl
AgNO₃ + NaCl → AgCl + NaNO₃
H₂ + Cl₂ → 2HCl
2Mg + O₂ → 2MgO
📝 Detailed explanation
Ion-exchange reactions in aqueous solution go to completion if a precipitate, a gas, or a weak electrolyte (like water) is formed. AgCl is an insoluble precipitate.
