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10.C【解析】反应前后气体分子总数不变，容器I、Ⅱ等温等体积，则气体压强之比为物质的量之比，平衡时，容器I与容器Ⅱ中的总压强之比为1：4，A项错误；容器I、Ⅱ的平衡为等效平衡，则平衡时容器I中c(2)=0.07mol·L1,l中c(L2)=0.28mol·L1,B项错误；平衡时，年=Y,则k正·c(H2)·c(12)=k递·c2(HI),平衡常数k=2(HI)c(H2)·c(12)，C项正确；K=k0.0620.07X0.07≈0.73，平衡时，向容器I中再通人0.1mol0.262H0.1moll和0.2 mol HI,Q=0.17×0.17≈2.34>K,故此时反应逆向进行， <噬，d项错误< p>
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