(2) NH4Cl+AgNO3= NH4NO3+AgCl↓
(1) Take a small amount of five kinds of nitrogen fertilizers in a test tube, add alkaline solution, and urea will be obtained without any phenomenon, so E is urea, and ammonium sulfate, ammonium chloride, ammonium nitrate and ammonium bicarbonate are ammonia-flavored; In addition, a small amount of four kinds of nitrogen fertilizers are added with dilute hydrochloric acid to generate D gas as ammonium bicarbonate; No ammonium sulfate, ammonium chloride and ammonium nitrate; Take the other three kinds of nitrogen fertilizers and add barium nitrate solution to produce white barium sulfate precipitate, which is ammonium sulfate; Dropping silver nitrate solution into the other two test tubes, B with white silver chloride precipitation is ammonium chloride, and C without phenomenon is ammonium nitrate;
Therefore, the chemical formulas of A, C, D and A and B are: A: (NH 4) 2SO4, C: NH 4 NO 3, D: NH 4 HCO 3, A: HCl, B: BA (NO 3) 2;
(2) According to (1), B is ammonium chloride, C is silver nitrate, and the chemical reaction equation between B and C solution is: NH4Cl+AgNO3 ═ AgCl ↓+NH4NO3.
So the answer is: (1)(NH 4) 2 SO 4, NH 4 NO 3, NH 4 HCO 3, HCl, Ba (NO 3) 2;
(2) ammonium chloride+silver nitrate ═AgCl↓+NH tetranitrate.