Cân bằng pthh 1, CuS2+HNO3→Cu(NO3)2+H2SO4+N2O+H2O 2,K2Cr2O7+KI+H2SO4→Cr2(SO4)3+I2+K2SO4+H2O 3,K2Cr2O7+KNO2+H2SO4→Cr2(SO4)3+KNO3+K2SO4+H2O

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1. Đáp án:

   4CuS2 + 22HNO3 → 4Cu(NO3)2+ 8H2SO4+ 7N2O+ 3H2O

   K2Cr2O7 + 6KI + 7H2SO4 → Cr2(SO4)3+ 3I2 + 4K2SO4 + 7H2O

   K2Cr2O7 + 3KNO2 + 4H2SO4 → Cr2(SO4)3 + 3KNO3 + K2SO4 + 4H2O

    

    

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2. 1,22HNO₃+4CuS₂→4Cu(NO₃)₂+3H₂O+8H₂SO₄+7N₂O

   2,7H₂SO₄+K₂Cr₂O₇+6KI→7H₂O+3I₂+4K₂SO₄+Cr₂(SO₄)₃

   _{3,4H2SO4+K2Cr2O7+3KNO2→4H2O+3KNO3+K2SO4+Cr2(SO4)3}

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