Hòa tan 23,2 gam Fe3O4 bằng dung dịch HNO3 đặc nóng dư, đến phản ứng hoàn toàn thu được V lít NO2 (sản phẩm khử duy nhất ở đktc). Giá trị của V là:         

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Một số câu hỏi khác cùng bài thi.

• Cho các phản ứng sau:1) 3FeO + 10HNO₃ → 3Fe(NO₃)₃ + NO + 5H₂O. 2) FeO + 2HCl → FeCl₂ + H₂O. 3) 2FeO + 4H₂SO₄ → Fe₂(SO₄)₃ + SO₂ + 4H₂O. 4) 3FeSO₄ + Al → Al₂(SO₄)₃ + 3Fe . Các phản ứng mà trong đó hợp chất sắt II thể hiện tính khử là?
  
• Thể tích dung dịch HNO₃ 1M (loãng) ít nhất cần dùng để hoà tan hoàn toàn một hỗn hợp gồm 0,15 mol Fe và 0,15 mol Cu là (biết phản ứng tạo chất khử duy nhất là NO)
  
• Để m gam phôi bào sắt ngoài không khí, sau một thời gian thu được 16 gam hỗn hợp X gồm Fe, FeO, Fe₃O₄ và Fe₂O₃. Hòa tan X hoàn toàn vào dung dịch HNO₃ thấy giải phóng 2,24 lít khí NO₂ đo ở đktc. Tính m gam phôi bào sắt
  

• Khi điện phân dung dịch chứa hỗn hợp Fe₂(SO₄)₃, CuSO₄ và HCl thì tại catot quá trình đầu tiên xảy ra là ?                  

• Hòa tan 23,2 gam Fe3O4 bằng dung dịch HNO3 đặc nóng dư, đến phản ứng hoàn toàn thu được V lít NO2 (sản phẩm khử duy nhất ở đktc). Giá trị của V là:         

• Nung nóng hỗn hợp Fe và S trong bình kín có chứa O2. Sau phản ứng hoàn toàn thu được rắn X và khí Y. Hòa tan X trong HCl dư thu được hỗn hợp khí Z. Khí Trong Y và Z lần lượt là:  

• Hai dung dịch đều phản ứng được với kim loại Fe là:         

• Hóa chất nào sau đây có thể sử dụng để phân biệt Fe₂O₃ và Fe₃O₄ ?  

• Hòa tan hoàn toàn hỗn hợp gồm 0,1 mol FeS₂ và x mol Cu₂S vào axit HNO₃ vừa đủ, thu được dung dich X (chỉ chứa 2 muối sunfat) và khí duy nhất NO. Giá trị của x là ?

• Sau khi kết thúc phản ứng, thí nghiệm nào sau đây tạo thành hợp chất sắt(III)?
  

Một số câu hỏi khác có thể bạn quan tâm.

• Cho dãy các kim loại: Na; Al; Cu; Fe; Ag. Số kim loại tác dụng được với dung dịch là:         

• Điện phân có màng ngăn với điện cực trơ 250 ml dung dịch hỗn hợp CuSO4 aM và NaCl 1,5M, với cường độ dòng điện 5A trong 96,5 phút. Dung dịch tạo thành có khối lượng bị giảm so với ban đầu là 17,15g. Giá trị của a là         

• Các kim loại  Fe, Cr, Cu cùng tan trong dung dịch nào sau đây?    

• Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks:

  Can we see (33)______ the earth is a globe? Yes, we can, when we watch a ship that sails out to sea. If we watch closely, we see that the ship begins (34)______. The bottom of the ship disappears first, and then the ship seems to sink lower and lower, (35)______ we can only see the top of the ship, and then we see nothing at all. What is hiding the ship from us? It is the earth. Stick a pin most of the way into an orange, and (36)______ turn the orange away from you. You will see the pin disappear, (37)______ a ship does on the earth.  

  Question 36:

• Hoà tan 4,8 gam Cu vào 250 ml dd NaNO3 0,5 M, sau đó thêm vào 250ml dd HCl 1 M. Kết thúc phản ứng thu được dung dịch X và khí NO duy nhất. Phải thêm bao nhiêu ml dung dịch NaOH 1 M vào X để kết tủa hết ion Cu2+.             

• Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks:

  Can we see (33)______ the earth is a globe? Yes, we can, when we watch a ship that sails out to sea. If we watch closely, we see that the ship begins (34)______. The bottom of the ship disappears first, and then the ship seems to sink lower and lower, (35)______ we can only see the top of the ship, and then we see nothing at all. What is hiding the ship from us? It is the earth. Stick a pin most of the way into an orange, and (36)______ turn the orange away from you. You will see the pin disappear, (37)______ a ship does on the earth.  

  Question 37:

• Kết luận nào sau đây đúng?         

• Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35:

                                                                                THE OLD GATE

  In the Middle Ages the vast majority of European cities had walls around them. They (31) _______ to defend the city, but they also kept out undesirable people, like those with contagious diseases. Most of London’s gates had been (32) _______ by the end of the eighteenth century. However, by a stroke of luck, the last of them was preserved. This gate is, in actual fact, not called a gate at all; its name is Temple Bar, and it marked the (33) _______ between the old City of London and Westminster. However, as the (34) _______ of traffic through London increased, Temple Bar became an obstacle to its free flow. In 1878 it was decided to take it down, so its stone were numbered, dismantled and put in storage. A couple of years later a wealthy businessman bought the stones and re-erected them at his house in Hertfordshire. In the 1970s the Temple Bar Trust was (35) _______ with the intention of returning the gate to the City of London. Much of the money for this project was donations from the Temple Bar Trust. The stonework needed a lot of restoration, which was carried out by the Cathedral Works Organization. Today, Temple Bar stands next to St Paul’s Cathedral.

  Question 35:   

• Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks:

  Many animals in the wild are suspicious and fearful of human beings. Many animals would take flight instantly (31)______ a human approaches. Man, however, soon discovered that some animals can be tamed or domesticated. Unlike animals in the wild, these animals would (32) _______ man to come close to them. They would even allow their owners to stroke or pet them. In the early times, man would domesticate animals by setting traps to catch their young. A young animal is (33) _______ easily domesticated than an adult one. From young, the animal learns to trust and obey its owner. Many different kinds of animals have been domesticated. Some common examples are animals like horses, elephants, chickens and pigs. The dog, which is also (34) _______as “man’s best friend”, is one of the first animals to have been domesticated. One of the most unusual animals to have been domesticated is the pig. In England long ago, the pig was a wild animal. It was a ferocious and aggressive (35)_______ which was not easily captured. Yet nowadays, the domesticated pig is no longer the lean and tough creature it used to be.  

  Question 32:  

• Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks:

  Many animals in the wild are suspicious and fearful of human beings. Many animals would take flight instantly (31)______ a human approaches. Man, however, soon discovered that some animals can be tamed or domesticated. Unlike animals in the wild, these animals would (32) _______ man to come close to them. They would even allow their owners to stroke or pet them. In the early times, man would domesticate animals by setting traps to catch their young. A young animal is (33) _______ easily domesticated than an adult one. From young, the animal learns to trust and obey its owner. Many different kinds of animals have been domesticated. Some common examples are animals like horses, elephants, chickens and pigs. The dog, which is also (34) _______as “man’s best friend”, is one of the first animals to have been domesticated. One of the most unusual animals to have been domesticated is the pig. In England long ago, the pig was a wild animal. It was a ferocious and aggressive (35)_______ which was not easily captured. Yet nowadays, the domesticated pig is no longer the lean and tough creature it used to be.  

  Question 31: