理论上不能设计为原电池的化学反应是（ ）
A．CH4(g)＋2O2(g) CO2(g)＋2H2O(1)；△H＜0 |
| B．HNO3(1)＋NaOH(1) NaNO3(1)＋H2O(1)；△H＜0 |
| C．2H2(g)＋O2(g) 2H2O(1)；△H＜0 |
| D．2FeCl3(1)＋Fe(s)==3FeCl2(1)；△H＜0 |
理论上不能设计为原电池的化学反应是（ ）
| A．CH4(g)＋2O2(g) CO2(g)＋2H2O(1)；△H＜0 |
| B．HNO3(1)＋NaOH(1) NaNO3(1)＋H2O(1)；△H＜0 |
| C．2H2(g)＋O2(g) 2H2O(1)；△H＜0 |
| D．2FeCl3(1)＋Fe(s)==3FeCl2(1)；△H＜0 |
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