Answer
(a) Fe(NO$_{3}$)$_{3}$ (aq) + NaOH(aq) → Fe(OH)$_{3}$(s) + NaNO$_{3}$(aq)
NO$^{-}_{3}$ + Na$^{+}$ → NaNO$_{3}$
(b) Zn(ClO$_{4}$)$_{2}$(aq) + K$_{2}$S(aq) → ZnS(s) + KClO$_{4}$(aq)
K$^{+}$ + Cl$^{-}$ + 4O$^{2-}$ → KClO$_{4}$
(c) Pb(NO$_{3}$)$_{2}$(aq) + KOH(aq) → Pb(OH)$_{2}$(s) + KNO$_{3}$(aq)
K$^{+}$ + NO$^{-}_{3}$ → KNO$_{3}$
(d) Zn(NO$_{3}$)$_{2}$(aq) + Na$_{2}$CO$_{3}$(aq) → ZnCO$_{3}$(s) + NaNO$_{3}$(aq)
NO$^{-}_{3}$ + Na$^{+}$ → NaNO$_{3}$
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