高温下,某反应达平衡,平衡常数K=。恒容时,温度升高,H2浓度减

高温下,某反应达平衡,平衡常数K=。恒容时,温度升高,H2浓度减小。下列说法正确的是(    

A.该反应的焓变为正值            

B.恒温恒容下,增大压强,H2浓度一定减小

C.升高温度,逆反应速率减小

D.该反应化学方程式为CO+H2O=CO2+H2

答案

A

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