: Trong các chất : FeCl₂, FeCl₃ , Fe(NO₃)₃, Fe(NO₃)₂, FeSO₄, Fe₂(SO₄)₃. Số chất có cả tính oxi hoá và tính khử là

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose a word that has different stress pattern:

  provide                     listen                           receive                    believe

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

  Although Ha Tay province has been merged into the metropolitan area of Hanoi, but many people are still worried.

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

  Heathrow Airport carries many international passengers than any other airports in the world.

• Choose the best answer for the following sentence:

  She had no ____________ of selling the clock - it had belonged to her grandfather.
  
  

• Choose the best answer for the following sentence:

  We hoped that Robert would agree to help us, but he has ___________ to.
  
  

• Choose the correct sentence which is built from the words and phrases given:

  The city / locate / on the north bank / the Potomac River //.
  
  

• Choose the correct sentence which is built from the words and phrases given:

  This capital / famous / the center / the federal government of the United States / and/ many / nation's monuments / museums //.
  
  

• Choose the correct sentence which is built from the words and phrases given:

  Washington, D.C. / also / host / 172 foreign embassies / as well as / the headquarters / many international organizations//.
  
  

• Choose the best answer for the following sentence:

  Nobody could hear her ____________ she spoke too quietly.
  
  

• Choose the best answer for the following sentence:

  Don't __________ with him while he’s working.