Помогите пожалуйста. Укажите вещества А и D в схеме реакции MgCl2+A--->Mg3(PO4)2+D а. Zn3(PO4)2, ZnCl2
б. AlPO4,AlCl3
в. Cu3(PO4)2, CuCl2
г. Na3PO4, NaCl
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