A.46% | B.50% | C.77.8% | D.82% |
A.⑥③④② | B.②③⑤① | C.②③④① | D.⑥①⑤③ |
A.热稳定性:HF>HCl>HBr>HI | B.熔沸点:H2O> H2Se> H2S |
C.还原性:F-> Cl->Br->I- | D.酸性:HI > HBr>HCl> HF |
A.Na2O2固体加入MgCl2溶液中 |
B.Ba(OH)2溶液跟(NH4)2SO4溶液共热 |
C.电石跟苏打水 |
D.三氯化铁溶液跟碳酸氢钠溶液 |
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