2KMnO₄ = K₂MnO₄ + MnO₂ ↓ + O₂↑
2Cu + O₂ = 2CuO
CuO = Cu + O₂↑
Cu + S = CuS↓
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2KMnO₄ = K₂MnO₄ + MnO₂ ↓ + O₂↑
2Cu + O₂ = 2CuO
CuO = Cu + O₂↑
Cu + S = CuS↓