题目

 （06年江苏卷）下列各组热化学方程式程中，化学反应的△H前者大于后者的是（）①C(s)＋O2(g)＝CO2(g)；△H1                          C(s)＋1/2O2(g)＝CO(g)；△H2②S(s)＋O2(g)＝SO2(g)；△H3                          S(g)＋O2(g)＝SO2(g)；△H4③H2(s)＋1/2O2(g)＝H2O(g)；△H5                   2H2(g)＋O2(g)＝2H2O(l)；△H6④CaCO3(s)＝CaO(s)＋CO2(g)；△H7                CaO(s)＋H2O(l)＝Ca(OH)2(s)；△H8A  ①    B  ④    C  ②③④    D  ①②③ 答案：答案：C

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