A beaker initially contains an aqueous solution of

CHEMISTRY · Single correct · AP · Chemistry · Chemical Reactions · Chemical Reactions

Problem

\text{Zn}(\text{NO}_3)_2

. Sodium hydroxide is added dropwise until excess OH⁻ is present, producing a precipitate that subsequently dissolves to form

[\text{Zn}(\text{OH})_4]^{2-}

. Concentrated hydrochloric acid is then added, regenerating

\text{Zn}^{2+}

in solution. Which of the following ions remains a spectator throughout the entire sequence? (a)

\text{Cl}^-

(b)

\text{Na}^+

(c)

\text{Zn}^{2+}

(d)

\text{OH}^-