利用下列反应可以将粗镍转化为纯度达99.9%的高纯镍。
反应一：Ni（粗，s）+4CO(g)
Ni(CO)4(g) ΔH ＜ 0
反应二：Ni(CO)4(g)
Ni(纯，s)+4CO(g) ΔH ＞ 0
下列说法错误的是
| A．对于反应一，适当增大压强，有利于Ni(CO)4的生成 |
| B．提纯过程中，CO气体可循环使用 |
| C．升高温度，反应一的反应速率减小，反应二的速率增大 |
| D．对反应二，在180—200℃，温度越高，Ni(CO)4(g)的转化率越高 |
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