Có hai dung dịch X và Y mỗi dung dịch chỉ chứa hai loại cation và hai loại anion trong số ion sau (X, Y không chứa cùng loại ion):

Biết dung dịch Y hòa tan được Fe₂O₃. Nếu đun đến cạn dung dịch X thì thu được m gam chất rắn khan. Giá trị của m là

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Một số câu hỏi khác có thể bạn quan tâm.

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

  Habitat fragmentation have caused plant and animal species in the remaining islands of habitat to lose contact with others of their own kind.

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

  endangered              destroyed                damaged                 provided

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

  attitude                survive                 introduce                 human

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

  medicine               priority                  crisis                   primary

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

  chemical               which                change                each

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

  protect                  commercial                 construction                climate

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

  we / dependent / nature / cannot survive ourselves / without wildlife
  
  

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

  environmental education / help / spread / environmental awareness / share practical techniques / solve the environmental problems
  
  

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

  we / engage / individuals / appreciate nature / the relationship / they have with wildlife
  
  

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

  everyone / pick up / one piece of trash / a day / about 6.6 billion pieces less