Thực hiện các thí nghiệm sau (ở điều kiện thường):         (a) Cho đồng kim loại vào dung dịch sắt (III) clorua.         (b) Sục khí hiđro sunfua vào dung dịch đồng (II) sunfat.         (c) Cho dung dịch bạc nitrat vào dung dịch sắt(III) clorua.         (d) Cho bột lưu huỳnh vào thủy ngân.         Số thí nghiệm xảy ra phản ứng là  

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  The greatest English scientist Issac Newton, _________ theory of gravitation is well-known throughout the world, was bom in Woolthorpe village, Cambridge, Britain.
  
  

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

  many                   humanitarian                       friend                       weather

• Choose a word that has different stress pattern:

  interrupt                   international                       information                       intelligent

• Choose the best answer for the following sentence:

  I and my close friend are not in the same school now but we write ___________ regularly.
  
  

• Choose the best answer for the following sentence:

  _____________ money for her further study, she spent all her summer holiday to do a
  part-time job.
  
  

• Choose the best answer for the following sentence:

  Long: “Three new hotels _____________ in our city so far.”

  Thai: “What a good new!”
  
  

• Choose the best answer for the following sentence:

  Teacher: “You think that you came without __________ ?”

  Nam: “I’m sorry because I didn’t ask for your permission”
  
  

• Choose the best answer for the following sentence:

  He didn’t know what ___________ around him when he was sleeping.
  
  

• Choose the best answer for the following sentence:

  When he ___________ home he turned on the radio.
  
  

• Choose the best answer for the following sentence:

  ___________ do you prefer, Chemistry or Physics?