A.该弱酸在滴定前的浓度是0.15 mol/L |
B.该弱酸稀释10倍后pH为4 |
C.滴定过程为求滴定终点,最合适的指示剂是酚酞 |
D.滴定过程为求滴定终点,最合适的指示剂是甲基橙 |
A.1:10:1010:109 | B.1:5:5×109:5×108 | C.1:20: 1010:109 | D.1:10:104:109 |
A.H2的燃烧热为241.8kJ/mol |
B.2H2(g)+O2(g)=2H2O(g);△H=-483.6kJ/mol |
C.1mol H2完全燃烧生成液态水放出的热量大于24l.8kJ |
D.断开1molH2O的化学键吸收的总能量大于断裂lmolH2和0.5molO2的化学键所吸收的总能量 |
A.若甲为强酸、乙为弱酸,则c(甲) :c(乙)="10" :1 |
B.若甲为弱酸,乙为强酸,则一定满足c(甲)>c(乙) |
C.若甲为强酸,乙为弱酸,则其物质的量浓度不可能相等 |
D.若甲、乙均为弱酸,则甲酸的电离常数一定比乙酸大 |
A.0.05mol/L | B.0.1mol/L | C.1.0mol/L | D.0.5mol/L |
A.2:1 | B.21:1 | C.20:1 | D.22:1 |
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