Dung dịch FeSO₄ có lẫn tạp chất CuSO₄. Phương pháp hóa học đơn giản để loại bỏ tạp chất là:

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

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

  Since soccer season has begun, my brother hasn’t had much free time.

• Choose the best answer for the following sentence:

  Next month we have two ________________________ holidays.
   

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

  As soon as the test was over in class yesterday, the student had left the room.

• Choose the best answer for the following sentence:

  We must follow __________________________ . 
   

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

  Before Bob will leave for work this morning, he’s going to lock the door.

• Choose the best answer for the following sentence:

  A meeting held during the night is a _____________________________ .
   

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

  Late afternoon yesterday while I prepared dinner, the doorbell rang.

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

  By the time he got to work, Dick was drinking three cups of coffee.

• Choose the best answer for the following sentence:

  It has belonged to our family. It's the __________________________ .
    

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

  I was very angry when the bus finally came because I have been waiting a long time for it.