1) K2S:
Molecular Equation: K2S + 2H2O → 2KOH + H2S
Ionic Equation: 2K+ + S2- + 2H2O → 2K+ + 2OH- + H2S
Net Ionic Equation: S2- + 2H2O → 2OH- + H2S

2) CuSO4:
Molecular Equation: CuSO4 + 2H2O → Cu(OH)2 + H2SO4
Ionic Equation: Cu2+ + SO4^2- + 2H2O → Cu(OH)2 + H2SO4
Net Ionic Equation: Cu2+ + 2OH- → Cu(OH)2

3) Na3PO4:
Molecular Equation: Na3PO4 + 3H2O → 3NaOH + H3PO4
Ionic Equation: 3Na+ + PO4^3- + 3H2O → 3Na+ + 3OH- + H3PO4
Net Ionic Equation: PO4^3- + 3H2O → 3OH- + H3PO4

4) Na2CO3:
Molecular Equation: Na2CO3 + H2O → 2NaOH + H2CO3
Ionic Equation: 2Na+ + CO3^2- + H2O → 2Na+ + 2OH- + H2CO3
Net Ionic Equation: CO3^2- + H2O → 2OH- + H2CO3

5) Cr2S3:
Molecular Equation: Cr2S3 + 6H2O → 2Cr(OH)3 + 3H2S
Ionic Equation: 2Cr^3+ + 3S^2- + 6H2O → 2Cr(OH)3 + 3H2S
Net Ionic Equation: 3S^2- + 6H2O → 6OH- + 3H2S