已知NH4CuSO3与足量的2mol/L硫酸溶液混合微热，产生下列现象：①有红色金属生成②产生刺激性气味的气体，③溶液呈现蓝色。据此判断下列说法正确的是
| A．反应中硫酸体现酸性 |
| B．NH4CuSO3中硫元素被氧化 |
| C．1mol NH4CuSO3完全反应转移0.5mol电子 |
| D．刺激性气味的气体是氨气 |
相关试题
I’m sure that your letter will get______ attention. They know you’re waiting for the reply. 
| A．continued | B．immediate | C．careful | D．general |
All the dishes in this menu, ______ otherwise stated, will serve two to three people. 
| A．as | B．if | C．though | D．unless |
The children loved their day trip, and they enjoyed the horse ride ______.
| A．most | B．more | C．less | D．little |
Progress______ so far very good and we are sure that the work will be finished on time.
| A．was | B．had been | C．has been | D．will be |
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