11.已知反应A2(g)+2B2(g)2AB2(g)的△H<0,下列说法正确的是A.升

11.已知反应A2(g)+2B2(g)2AB2(g)的△H<0,下列说法正确的是

A.升高温度,正向反应速率增加,逆向反映速率减小

B.升高温度有利于反应速率增加,从而缩短达到平衡的时间

C.达到平衡后,升高温度或增大压强都有利于该反应平衡正向移动

D.达到平衡后,降低温度或减小压强都有利于该反应平衡正向移动

答案

B  

解析:A2(g)+2B2(g)2AB2(g)是放热反应,且是气体体积减小的反应。所以升高温度,平衡向逆反应方向移动;增大压强,平衡向正反应方向移动,C、D均错误。升高温度,正、逆反应速率均加快,达到平衡需要的时间减少,A错误,正确答案为B。

 


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