Cho các chất và ion sau : Zn ; Cl₂ ; FeO ; Fe₂O₃ ; SO₂ ; H₂S ; Fe²⁺ ; Cu²⁺ ; Ag⁺. Số lượng chất và ion vừa đóng vai trò chất khử, vừa đóng vai trò chất oxi hóa là :

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  If I ____________, I’ll let you know.
   

• Choose the best answer for the following sentence:

  If only he _________ me a chance, I could have told him the truth.
   

• Choose the best answer for the following sentence:

  Get me a glass of lemonade if _________ you to the kitchen.
   

• Choose the best answer for the following sentence:

  If I ___________ you, I’d save some of your lottery winning.
   

• Choose the best answer for the following sentence:

  If the car ___________ larger, we would have bought it.
  
  

• Choose the best answer for the following sentence:

  If only I ___________ you wanted to invest money in business.
   

• Choose the best answer for the following sentence:

  If I were to leave my country, I ____________ disappointed.
   

• Choose the best answer for the following sentence:

  If he hadn’t wasted too much time, he ___________ in his examination.
   

• Choose the best answer for the following sentence:

  If I had taken that English course, I _________ much progress.

• Choose the best answer for the following sentence:

  If you inherited a million pounds, what __________ with the money?