Cho m gam bột Fe vào bình kín chứa đồng thời 0,06 mol O₂ và 0,03 mol Cl₂, rồi đốt nóng. Sau khi các phản ứng xảy ra hết chỉ thu được hỗn hợp chất rắn chứa các oxit sắt và muối sắt (không còn khí dư). Hòa tan hết hốn hợp này trong một lượng dung dịch HCl (lấy dư 25% so với lượng cần phản ứng) thu được dung dịch X. Cho dung dịch AgNO₃ dư vào X, sau khi kết thúc các phản ứng thì thu được 53,28 gam kết tủa (biết sản phẩm khử của N⁺⁵ là khí NO duy nhất). Giá trị của ml

A. 5,88

B. 5,60

C. 6,44

D. 6,72

Cho các phản ứng sau:

(a)  FeS + 2HCl → FeCl₂ + H₂S

(b) Na₂S + 2HCl → 2NaCl + H₂S

(c) 2AlCl₃ + 3Na₂S + 6H₂O → 2Al(OH)₃ + 3H₂S + 6NaCl

(d) KHSO₄ + KHS → K₂SO₄ + H₂S

(e) BaS + H₂SO₄ (loãng) → BaSO₄ + H₂S

Số phản ứng có phương trình ion rút gọn S^2- + 2H⁺ → H₂S là

A. 4

B. 3

C. 2

D. 1

17. Alexandar Graham Bell invented the telephone in 1876.

-> the telephone was invented in 1876 by Alexandar Graham Bell

18. Nam repainted the school gate last week.

-> the school gate was repainted last week by Nam

19. People can use the train a lot.

-> the train can be used a lot

20. Christopher discovered America in 1949.

-> America was discovered in 1949 by Christopher

21. Minh has seen the accident on the road.

-> the accident has been seen on the road by Minh

22. My father told the funny story last night.

-> the funny story was told last night by my father

23. The policeman taken Lam to the police station.

-> Lam was took to the police station by the policeman

24. Mr. Ha repaired this machine yesterday.

-> this machine was repaired yesterday by Mr. Ha

25. My mother kept clean the kitchen.

-> the kitchen was kept clean by my mother

26. The little has eaten the eggs.

-> the eggs has been eaten by the little

27. Tim took Hoa to the chocolate factory yesterday.

-> Hoa was taken to the chocolate factory yesterday by Tim

28. We do our homework everyday.

-> our homework is done everyday

29. Mr Thoi taught me English last year.

-> I was taught English last year by Mr. Thoi

30. People built this school two years ago.

-> this school was built two years ago

31. My mother took me to the zoo yesterday

-> I was taken to the zoo yesterdayby my mother

32. Blair invented a color television in 1928.

-> a color was invented television in 1928 by Blair

33. John gave me/ these records last week.

-> I was given these records last week by John

-> there records given to me last week by John

34. Our club holds meetings once a month.

-> meetings is being holded once a moth by our club

35. She doesn’t find anything in that box.

-> anything is fought in that box

- Tiết kiệm sẵn có đồng tiền

That was the first time I had seen the president

Choose the word whose main stress is placed differently from the others
1.A. equipment B farmer C. grandma D. story

2.A. tradition B. equipment C. electricity D. semester

3.A. servant B. master C. wisdom D. escape

4.A. believe B. improve C. promise D. prefer

5.A. language B. learner C. meaning D. revision

6. A. escape B. unite C. wisdom D. appear

7.A. comment B. upset C. habit D. cruel

8.A. orphanage B. magically C. festival D. recycle

Dung dịch A gồm HCl 0,2M; HNO₃ 0,3M; H₂SO₄ 0,1M; HClO₄ 0,3M, dung dịch B gồm KOH 0,3M; NaOH 0,4M; Ba(OH)₂ 0,15M. Cần trộn A và B theo tỉ lệ thể tích là bao nhiêu để được dung dịch có pH = 13?

A. 11 : 9.

B. 9 : 11.

C. 101 : 99.

D. 99 : 101.

Độ âm điện của Al và Cl lần lượt bằng 1,6 và 3,0. Liên kết hóa học giữa các nguyên tử trong phân tử AlCl₃ là

A. liên kết ion

B. liên kết cộng hóa trị có cực.

C. liên kết kim loại

D. liên kết cộng hóa trị không cực.

1. A.lakes B.markets C.museums D.lamps