Решите пожалуйста
а)Cu2S + HNO3(конц.)---- Сu(NO3)2 + SO2 + NO
б)FeS2 + HN03(конц) ----- Fe(NO3)2 + H2SO4+ NO2
в)FeCl3+ KI ----- FeCl2 = I2+ kCL
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