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№1.
CuO + 2HNO₃ = Cu(NO₃)₂ + H₂O
СuO + 2H⁺ + 2NO₃⁻= Cu²⁺ + 2NO₃⁻ + H₂O
СuO + 2H⁺ = Cu²⁺ + H₂O
№2.
MnS + 2HCl = MnCl₂ + H₂S
MnS + 2H⁺ + 2Cl⁻ = Mn²⁺ + 2Cl⁻ + H₂S
MnS + 2H⁺ = Mn²⁺ + H₂S
№3.
NH₄Cl + NaOH = NaCl + NH₃ + H₂O
NH₄⁺ + Cl⁻+ Na⁺+ OH⁻ = Na⁺ + Cl⁻+ NH₃ + H₂O
NH₄⁺ + OH⁻ =NH₃ + H₂O