(i) Ag2CO3 + Δ → 2Ag + CO2
(ii) MgSO4 + NH4OH + Na2HPO4 → Mg(NH4)PO4 ↓ (white) + H2O + Na2SO4
(iii) Zn2+ + 2NH4OH → Zn(OH)2 ↓ (white) + 2NH4+
Zn(OH)2 + 4NH4OH → [Zn(NH3)4] (OH)2 + 4H2O
(iv) 2Bi(NO3)3 + 6KI → 2Bi ↓ (Black) + 6KNO3 + 3I2
I2 + KI → KI3 (Yellow solution)
(v) Na2HPO4 + 12 (NH4)2MoO4 +23 HNO3 → (NH4)3PMo12O40 ↓ (Canary yellow) + 2NaNO3 + 21NH4NO3 + 12H2O