• 2022-06-15
    分别指出下列物质水溶液的颜色 :[br][/br]① NiSO4∙7 H2O ② ZnSO4∙7 H2O ③ KMnO4 ④ KAl (SO4)2∙12 H2O[br][/br]⑤ K2Cr2O7 ⑥ K4[Fe (CN)6] ⑦ FeSO4∙7 H2O ⑧ Ca (NO3)2∙4 H2O[br][/br]⑨ CuSO4∙5 H2O ⑩ Pb (CH3COO)2∙3 H2O