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

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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.

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