Để tách riêng từng chất từ hỗn hợp benzen, anilin, phenol ta chỉ cần dùng các hoá chất (dụng cụ, điều kiện thí nghiệm đầy đủ) là:

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  Is _______________________ a post office near here?
   

• Choose the best answer for the following sentence:

  ____________________ countries still have a king or a queen, don’t they?
  
  

• Choose the best answer for the following sentence:

  __________________ tells me you’ve got ___________________ bad news for me.
   

• Find a mistake in the four underlined parts of the sentence and correct it:

  Maria is not a citizen of the United States, so she has to pay income taxes anyway.

• Find a mistake in the four underlined parts of the sentence and correct it:

  The television broadcast was interrupted for fifty minutes. However, most of the audience

  missed the second half of the football match.

• Find a mistake in the four underlined parts of the sentence and correct it:

  Nobody else is going to turn up now for the lesson, so you must as well go home.

• Find a mistake in the four underlined parts of the sentence and correct it:

  There’s a lift in the building, so we mustn’t climb the stairs.

• Find a mistake in the four underlined parts of the sentence and correct it:

  A driver’s license can obtain from the licensing Bureau at the comer of Pine street.

• Find a mistake in the four underlined parts of the sentence and correct it:

  When you are on duty, your uniform must have been worn at all times.

• Find a mistake in the four underlined parts of the sentence and correct it:

  A ball eagle can distinguish from other large birds by its white head and white tail.