A. | B. | C. | D. |
A.PH值小于7的溶液 | B.酚酞显无色的溶液 |
C.溶液中c(H+)>c(OH-) | D.溶液中含有H+ |
A.2H2(g)+O2(g) = 2H2O(1)△H= ―285.8kJ/mol |
B.2H2(g)+ O2(g) = 2H2O(1)△H= +571.6 kJ/mol |
C.2H2(g)+O2(g) = 2H2O(g)△H= ―571.6 kJ/mol |
D.H2(g)+ O2(g) = H2O(1)△H= ―285.8kJ/mol |
A.5 | B.6 | C.7 | D.8 |
A.a>b | B.a=10-4b | C.b =10-4 a | D.a =b |
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