反应Pb2++Sn=Pb+Sn2+;Sn2++Cd=Sn+Cd2+在标准态条件下都能自发进行。由此可知()
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反应Pb2++Sn=Pb+Sn2+;Sn2++Cd=Sn+Cd2+在标准态条件下都能自发进行。由此可知()
A.Ey(Cd2+/Cd)>Ey(Sn2+/Sn)>Ey(Pb2+/Pb)
B.Ey(Pb2+/Pb)>Ey(Cd2+/Cd)>Ey(Sn2+/Sn)
C.Ey(Pb2+/Pb)>Ey(Sn2+/Sn)>Ey(Cd2+/Cd)
D.Ey(Sn2+/Sn)>Ey(Pb2+/Pb)>Ey(Cd2+/Cd)
参考答案: