sat化学题given the hypothetical reaction 2A+B=C+3D ,the equilib

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sat化学题
given the hypothetical reaction 2A+B=C+3D ,the equilibrium constant for this reaction is
I.directly proportional to the concentration of D cubed.
II,inversely proportional to the concentration of A.
III.inversely proportional to the concentration of C.
I 为什么II不对?既然与I成正比,根据公式也应该与II成反比啊.
还有个题，a catalyst act by increasing the rate of the forword reaction more than the reverse reaction.这是一个题的选项，这个选项是错误的，为什么错了？

1.应该是和A的平方成反比,第一句说的是和D的三次方成正比
2.催化剂能加速反应是同时加快了正反应和逆反应的速度,不是说只加快正反应的速度,不加快逆反应的速度

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