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某学习小组探究氨的还原性及检验产物的性质,按下图装置进行实验(夹持仪器已略去).将B处的Cr 2 O 3 加热至红热,再鼓入空气,已知:无水CaCl 2 可吸收氨气和水 回答下列问题: (1)B中发生反应的化学方程式是______. (2)证明氨气发生了催化氧化的现象是______,发生反应的方程式是______. (3)E中铜发生反应的离子方程式是______. (4)E中缓缓通入空气的目的是______. (5)氨作为燃料电池燃气时发生的总反应为4NH 3 +3O 2 =2N 2 +6H 2 O,该燃料电池以KOH溶液为电解质溶液,负极反应式是______.
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