Verified answer

Pb(NO₃)₂ + 2KCl = PbCl₂↓ + 2KNO₃

Pb²⁺ +2NO₃⁻ + 2K⁺ + 2Cl⁻ = PbCl₂↓ + 2K⁺ + 2NO₃⁻

Pb²⁺ + 2Cl⁻ = PbCl₂↓  

Pb(NO₃)₂ + Na₂S = 2NaNO₃ + PbS↓

Pb²⁺ + 2NO₃⁻ + 2Na⁺ + S²⁻ = 2Na⁺ + 2NO₃⁻ + PbS↓

Pb²⁺ +  S²⁻ = PbS↓

Pb(NO₃)₂ + CuSO₄ = Cu(NO₃)₂ + PbSO₄↓

Pb²⁺ + 2NO₃⁻ + Cu²⁺ + SO₄²⁻ = Cu²⁺ + 2NO₃⁻ + PbSO₄↓

Pb²⁺ +  SO₄²⁻ = PbSO₄↓

CuSO₄ + Na₂S = CuS↓ + Na₂SO₄

Cu²⁺ + SO₄²⁻ + 2Na⁺ + S²⁻ = CuS↓ + 2Na⁺ + SO₄²⁻

Cu²⁺+ S²⁻ = CuS↓

Na₂S + KCl ≠

CuSO₄ + KCl ≠