Answer
(a) H$^{+}$ (aq) + O$^{-}$–(aq) → H$_{2}$O(l)
(b) Pb$^{2+}$ (aq) + CO$^{2-}_{3}$–(aq) → PbCO$_{3}$(s)
(c) 2 Ag+(aq) + SO$^{2-}{4}$(aq) → Ag$_{2}$SO$_{4}$(s)
(d) S$^{2-}$ (aq) + Zn$_{2}$+(aq) → ZnS(s)
Work Step by Step
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