现有酸性KMnO4和Pb(NO2)2溶液各一杯,选金属铂(Pt)棒插入KMnO4溶液中,金属铅(Pb)棒插入Pb(NO2)2溶液中,已知参与反应物质浓度均为1mol.L-1,φΘ(Pb2+/Pb)=-0.126V,φΘ(MnO4-/Mn2+)=+1.491V.  (1)试判断该原电池反应自发进行的方向。  (2)完成并配平上述原电池反应方程式,以及两电极反应式。  (3)用电池符号表示该原电池,并计算其标准电动势和平衡常数。

现有酸性KMnO4和Pb(NO22溶液各一杯,选金属铂(Pt)棒插入KMnO4溶液中,金属铅(Pb)棒插入Pb(NO22溶液中,已知参与反应物质浓度均为1mol.L-1,φΘ(Pb2+/Pb)=-0.126V,φΘ(MnO4-/Mn2+)=+1.491V.  (1)试判断该原电池反应自发进行的方向。  (2)完成并配平上述原电池反应方程式,以及两电极反应式。  (3)用电池符号表示该原电池,并计算其标准电动势和平衡常数。


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单选题根据《环境影响评价技术导则大气环境》,以下评价等级正确的是( )A pPsubmax/sub≥10%为一级评价/pB pPsubmax/sub≥80%为一级评价/pC pPsubmax/sub≤10%为三级评价/pD p 10%≤Psubmax/sub≤80%为二级评价/p