Để phân biệt 3 dung dịch riêng biệt: H2NCH2COOH, CH3COOH, C2H5NH2 ta dùng thuốc thử nào sau đây?  

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Một số câu hỏi khác có thể bạn quan tâm.

• Mark the letter A, B, C or D to indicate the correct answer to each of the following questions:

  Experts ________ feel that they are related to the deep wishes and fears of the dreamer.         

• Mark the letter A, B, C or D to indicate the correct answer to each of the following questions:

  We all seem to have a different opinion, so let’s let Joey decide, ________?  

• Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions:   

  They'll be able to walk across the river_________.         

• Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions: 

  John failed again. He _______ harder.         

• Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions:   

  Did he tell you __________?         

• Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions:   

  Most of us would maintain that physical______does not play a major part in how we react to the people we meet.          

• Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following question.

  I recommended that she ___________ reduce her expenditure.         

• Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions:

  The weather was very nice, so he found________a raincoat with him.  

• Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions:  

  That is a problem ______ the government is now dealing.         

• Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions:   

  Out ______ when the bell rang.