有NH₄⁺、Fe³⁺、NO₃^﹣、Fe²⁺、H⁺和H₂O六种微粒，分别属于一个氧化还原反应中的反应物和生成物．

（1）氧化剂与还原剂的物质的量之比为____ 

（2）若有l mol NO₃^﹣参加反应，则转移____ mol e^﹣

（3）若把该反应设计为原电池，则负极反应为____ ．

读一读Tom的日记，根据日记内容，选择正确的答案。

June 8, Friday    rainy

    Our school had an English Fun Day today. My classmates and l went to the School Hall to play English games. Some Grade 6 students were helpers and they showed us how to play the games.

    Peter and l were in a spelling(拼写) game. He made many mistakes but I did very well. I got some sweets and we shared(分享) them.

We did not like the matching(配对) game. We had to match some words to pictures. It was not difficult but boring.

    We liked the reading game. I was slow when I read out the sentences. But Peter was very quick. He won the first prize. Miss Wong gave him a photo album. He can put his photos in. We had a good time.