Cho 5,5 gam Fe vào 200 ml dung dịch Cu(NO3)2 0,5M và HCl 1M thu được khí NO và m gam kết tủa. Xác định m. Biết rằng NO là sản phẩm khử duy nhất của NO3- và không có khí H2 bay ra         

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the word that has the underlined part pronounced differently from the rest:

  glance                   hand                 navy                     master

• Choose a word that has different stress pattern:

  embarrass                  memory                     imagine                        exciting

• Choose a word that has different stress pattern:

  schoolbag                   decide                   replace                  escape

• Choose the best answer for the following sentence:

  In Hamlet, the opening scene ____________ place at night.

   

• Choose the best answer for the following sentence:

  John ______________ his first piece of music when he was ten years old.

   

• Choose the best answer for the following sentence:

  While Mai ____________ the meal, her brother _____________the house. 

   

• Choose the best answer for the following sentence:

  When I ______________ home, my parents _______________ to work.

   

• Choose the best answer for the following sentence:

  I ______________ this hat only once since I _______________ it.

   

• Choose one sentence that has the same meaning as the root one:

  I haven't seen this kind of hat before.

   

• Choose one sentence that has the same meaning as the root one:

  He read a newspaper during breakfast.