1) 3H₂S + Fe₂O₃ → 2FeS + S + 3H₂O
S²⁻ - 2e → S⁰ | 1
Fe³⁺ + 1e → Fe²⁺ | 2
2) 8Cl₂ + Ca₃P₂ + 8H₂O → 3CaCl₂ + 2H₃PO₄ + 10HCl
Cl₂⁰ + 2e → 2Cl⁻ | 8 | 4
P³⁻ - 8e → P⁵⁺ | 2 | 1
3) KClO₃ + 2CrCl₃ +10 KOH → 2K₂CrO₄ + 7KCl + 5H₂O
Cl⁵⁺ + 6e → Cl⁻ | 3 | 1
Cr³⁺ - 3e → Cr⁶⁺ | 6 | 2
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Answers & Comments
1) 3H₂S + Fe₂O₃ → 2FeS + S + 3H₂O
S²⁻ - 2e → S⁰ | 1
Fe³⁺ + 1e → Fe²⁺ | 2
2) 8Cl₂ + Ca₃P₂ + 8H₂O → 3CaCl₂ + 2H₃PO₄ + 10HCl
Cl₂⁰ + 2e → 2Cl⁻ | 8 | 4
P³⁻ - 8e → P⁵⁺ | 2 | 1
3) KClO₃ + 2CrCl₃ +10 KOH → 2K₂CrO₄ + 7KCl + 5H₂O
Cl⁵⁺ + 6e → Cl⁻ | 3 | 1
Cr³⁺ - 3e → Cr⁶⁺ | 6 | 2