题目:
下列说法正确的是
A.反应2A(g) + B(g) =" 3C" (s) + D(g)在一定条件下能自发进行,说明该反应的ΔH<0
B.常温下,将pH=4的醋酸溶液稀释后,溶液中所有离子的浓度均降低
C.常温下,H2CO3分子不可能存在于pH=8的碱性溶液中
D.在合成氨工业中,移走NH3可增大正反应速率,提高原料转化率
答案:
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