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【简答题】
已知A～G有如图所示的转化关系（部分生成物已略去），其中A、G为单质，D是能使湿润的红色石蕊试纸变蓝色的气体，E、F均能与NaOH溶液反应。 请回答下列问题： （1）写出F的电子式： （2）①C溶液与D反应的离子方程式为 ②F溶液与NaOH溶液共热反应的化学方程式为 （3）①请用离子方程式解释C溶液为何显酸性 ②F溶液中离子浓度由大到小的顺序为 （4）将5.4gA投入200mL 2.0mol/L某溶液中有G单质产生，且充分反应后有金属剩余，则该溶液可能是 （填代号） A．HNO 3 溶液      B．H 2 SO 4 溶液    C．NaOH溶液  D．HCl溶液 （5）将1molN 2 和3molG及催化剂充入容积为2L的某密闭容器中进行反应，已知该反应为放热反应。平衡时，测得D的物质的量浓度为a mol/L。 ①如果反应速率v(G)＝1.2mol/(L·min)，则v(D)＝ mol/(L·min) ②在其他条件不变的情况下，若起始时充入0.5molN 2 和1.5molG达到平衡后，D的物质的量浓度 （填“大于”、“小于”或“等于”）a/2 mol/L。 ③该条件下的平衡常数为 （用含a的代数式表示）
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