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10.甲同学:(1)黑色沉淀中不含有CuO
(2)① 还原 ② B试管中出现白色沉淀
2NO3- +3SO2 + 3Ba2+ + 2H2O = 3BaSO4↓+ 2NO↑+ 4H+
(或NO2 + SO2 + Ba2+ + H2O = BaSO4↓+ NO↑+ 2H+)
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(3)CuS + 4H2SO4(浓)== CuSO4 + 4SO2↑ + 4H2O
乙同学:CuS