Đáp án:
`Fe_{2}O_{3},CuO,Na_{2}O,Al_{2}O_{3}`
Giải thích các bước giải:
Dãy `A` gồm có các oxit bazơ nên có thể tác dụng với `HCl.`
Dãy các oxit tác dụng với dung dịch axit clohiđric (HCl) là
: Fe2O3, CuO, Na2O, Al2O3.
SO2, MgO, CO2, Ag2O. =>loại SO2
CaO, CO, N2O5, ZnO.=> loại CO
CuO, Fe2O3, CO2, FeO.=> loại CO2
D. Choose the correct sentence among A, B, C or D which has the same meaning as the given one. 9. I might go camping. My friends have invited me. A. My friends have invited me to go camping. B. My friends have invited me go camping. C. My friends have invited me going camping. D. My friends have invited me that I might go camping. 10. I haven’t enjoyed myself so much for years. A. It’s years since I enjoyed myself so much. B. It’s years since I have enjoyed myself so much. C. It was years since I had enjoyed myself so much. D. It has been years since I have enjoyed myself so much. 11. Have you heard the good news? A. Carol in March had a baby. B. In March, Carol had a baby. C. Carol had in March a baby. D. In March, had Carol a baby. 12. Although the driver slammed on his brakes, __________________ A. he was able to avoid hitting the small dog. B. the small dog was not hit by the car. C. he could run over the small dog. D. he couldn’t avoid hitting the small dog. 14. This is my tenth year working in this bank. A. By the end of this year , I will work in this bank for ten years. B. I have worked in this bank for ten years by the end of this year. C. By the end of this year , I will have worked in this bank for ten years. D. I had been working in this bank for ten years by the end of this year. 15. The famous actor was last seen in 2000. A. The famous actor has not been able to see since 2000. B. No one has seen the famous actor since 2000. C. The famous actor didn’t see anyone in 2000. D. No one saw the famous actor until 2000. 16. I came to live here three months ago. A. It was three months since I lived here. B. I’ve been living here for three months. C. I lived here for three months. D. I didn’t live here for three months. 17. She is sitting in a hotel room. Through the window, she sees a fat man. A. She looks through the window and sees the fat man. B. She and the fat man are in a hotel room. C. The fat man wants to open the window and come in. D. The fat man is looking in through the window. 18. She goes to the shops every Friday. A. She goes every day to the shop but not on Friday. B. It’s not Friday, but she’s going to the shops. C. She always goes to the shops on Friday. D. She never goes to the shops on Friday. 19. Michael took a deep breath and dived into the water. A. After Michael had taken a deep breath, he dived into the water. B. Having taken a deep breath, he dived into the water. C. After Michael took a deep breath, he had dived into the water. D. A & B are correct. 20. We started working here three years ago. A. We worked here for three years. B. We have no longer worked here for three years. C. We have worked here for three years. D. We will work here in three years. 21. It’s a long time since we last went to the cinema. A. We have been to the cinema for a long time. B. We haven’t been to the cinema for a long time. C. We don’t go to the cinema as we used to. D. We wish we went to the cinema now. 22. I haven’t finished this book yet. A. I’m still reading this book. B. I have read this book before. C. The book I’m reading hasn’t finished. D. I will read this book some day. 23. He used to jog every morning. A. He enjoys jogging every morning. B. He never fails to jog every morning. C. He doesn’t now jog every morning. D. He intended to jog every morning. 24. I have never felt happier than I do now. A. I felt happier before. B. I feel happy now. C. I have never felt happy. D. I have always felt happy. 25. He last had his eyes tested ten months ago. A. He hasn’t had his eyes tested for ten months . B. He had not tested his eyes for ten months then. C. He had tested his eyes ten months before. D. He didn’t have any test on his eyes in ten months. 26. Someone knocked on the door during my lunchtime. A. I had lunch when someone knocked on the door. B. When I had had lunch, someone knocked on the door. C. I was having lunch when someone was knocking on the door. D. I was having lunch when someone knocked on the door. 27. Steve left before my arrival. A. When I arrived, Steve had already left. B. Steve left as soon as I arrived. C. While Steve was leaving I arrived. D. Steve hadn’t left until I arrived. 28. I haven’t been here before. A. Being here is a pleasant experience. B. This is the first time I have been here . C. I have wished to be here for long. D. Before long I will be here. 29. The last time I saw Rose was three years ago. A. I hasn’t seen Rose for three years. B. I haven’t seen Rose three years ago. C. I haven’t seen Rose since three years. D. I haven’t seen Rose for three years. 30. When we arrived, the children were playing “Hide and Seek” A. The children played “Hide and Seek” and then we arrived. B. While the children were playing “Hide and Seek”, we arrived. C. We arrived at the same time the children played “Hide and Seek”.
Phần trăm khối lượng của Ca có trong CaO là: 71,43 % 42,86% 57,14% 28,57 %
làm hộ mình với. nhanh lên nhé!!!
vẽ mầm bất lực nl : mấy bạn đặt câu văn hài thế nhỉ =))) kêu làm sáng tỏ nhận định mà k phân tích thì sáng tỏ kiểu gì ? viết dài lại kêu sao chép =)) tôi bó tay cái môn này luôn đó ?
Mn lm ơn tính giúp em câu b bài này vs ạ ! Em đg cần gấp ! Em cảm ơn
MN ơi giúp mình với, mình cảm ơn ạ
Oxit là: Hợp chất của nguyên tố phi kim với một nguyên tố hoá học khác. Hợp chất của nguyên tố kim loại với một nguyên tố hoá học khác. Hợp chất của oxi với một nguyên tố hoá học khác. Hỗn hợp của nguyên tố oxi với một nguyên tố hoá học khác.
Cho 4,86g bột Al vào 400 ml dd X chứa CuSO4 amol/l và FeSO4 b mol/l, thu được dd Y chứa hai muối và 16,32g chất rắn Z. Cho Y tác dụng với lượng dư dung dịch Ba(OH)2, thu được 88,75g kết tủa. Biết các phản ứng xảy ra hoàn toàn, tính giá trị của a và b
Calli: / Toi te lam.. / Yc: Tradi, tone xanh dương + vàng, có tâm, không nhận các trường hợp mới tập viết hay không quen tay j j đó, k đổi đề.
Câu30 : Cho chất X có CTPT C3H6O2. X phản ứng với dung dịch NaOH. Số CTCT của X thỏa mãn tính chất trên là:A. 3 B. 2 C. 4 D. 1 Câu 31 Đốt cháy hoàn toàn 3,25 g hỗn hợp các axit, este cần vừa đủ 0,1225 mol O2 và thu được 5,28g CO2. Toàn bộ 3,25 g hỗn hợp trên tác dụng vừa đủ với 100 ml dung dịch NaOH a mol/l. Giá trị của a là A. 0,75. B. 0,5. C. 0,250. D. 1,0.
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