下列化合物：①SO3 ②Fe（OH）3 ③FeCl2 ④CuS ⑤H2SiO3 ⑥NaHCO3其中不可能通过化合反应制得的是（ ）
A．①②⑤⑥
B．③④⑤⑥
C．④⑤
D．①②③⑤
：①二氧化硫与氧气在催化剂、加热的条件下生成SO3 发生化合反应，故①正确；
②氢氧化亚铁与氧气、水反应生成Fe（OH）3，发生化合反应，故②正确；
③铁与氯化铁反应生成FeCl2，发生化合反应，故③正确；
④铜与硫反应生成Cu2S，不能生成CuS，故④错误；
⑤二氧化硅不溶于水，不与水反应，不能化合生成H2SiO3 故⑤错误；
⑥碳酸钠、水、二氧化碳反应生成NaHCO3，发生化合反应，故⑥正确．
故选：C．
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