Câu 4[NB]( (0,167). Trong các phản ứng sau, phản ứng nào là phản ứng phân hủy ? A. Cu(OH)2 CuO + H2O B. CaO + CO2 CaCO3. C. Zn + 2 HCl ZnCl2 + H2. D. NaOH + HCl NaCl + H2O. Câu 5[NB]( (0,167). Trong các phản ứng sau, phản ứng nào là phản ứng thế? A. 2KMnO4 K2MnO4 + MnO2 + O2. B. CaO + CO2 CaCO3. C. Zn + 2 HCl ZnCl2 + H2. D. NaOH + HCl NaCl + H2O.Câu 6[NB]( (0,167). Trong các phản ứng sau, phản ứng hóa hợp là A. 2KMnO4 K2MnO4 + MnO2 + O2. B. CaO + CO2 CaCO3. C. Zn + 2 HCl ZnCl2 + H2. D. NaOH + HCl NaCl + H2O. Câu 7[NB]( (0,167). Phản ứng nào sau đây là phản ứng thế ? A. Fe2O3 + 3 H2 2Fe + 3H2O B. Na2O + H2O 2NaOH. C. Fe2O3 + 6HCl 2FeCl3 + H2O. D. 2KClO3 2KCl + O2. Câu 8[NB]( (0,167). Phản ứng nào sau đây thuộc loại phản phân hủy ? A. 2H2 + O2 2H2O. B. 2KClO3 2KCl + 3O2 . C. HCl + NaOH NaCl + H2O. D. Zn + 2HCl ZnCl2 + H2 giúp mik câu này với mai mình sắp thi rồi

Các câu hỏi liên quan

1. She doesn’t live in London because she doesn’t know anyone there  She’d will lived in london if she known anyone in there 2. I can’t live in the country because I can’t find a job there  I’d will 3. I don’t have a spare ticket. I can’t take you to the concert  If I ………………………………………………………………... 5. They don’t understand the problem. They won’t find a solution  If they didn’t undertand the problem they wont find the solution 6. He sits around too much. He isn’t fit.  If he not sat ảound too much he wont fit 7. She’s very thin; perhaps that’s why she feels cold so much.  If she wasn’t thin she will feels cold so much 8. He never polishes his shoes, so he never looks smart  If he polished his shoes he will looks smart 9. He can’t park near his office; that’s why he doesn’t come by car  If he wasn’t come by car he couldn’t park near his office 10. My house is guarded by two big dogs. That’s the only reason it isn’t broken into every night  If my house 11. The flats are not clearly numbered, so it is very difficult to find anyone.  If the flats …..……………………………………………………….. 12. I don’t know her e-mail address, so I can’t tell you  If I ……………………………………………………………………. 13. She works in the evening. She has no time to play with her children  If she …………………………………………………………………. 14. I am not tall enough to join the basketball team  If I …………………………………………………………………… 15. He doesn’t see the signal so he doesn’t stop his car  If he …………………………………………………………………. 16. Peter gets bad marks because he doesn’t prepare his lessons well  If Peter ……………………………………………………………… 17. Mary doesn’t have enough money. She can’t buy a new car.  If Mary ……………………………………………………………… 18. Go right now or you’ll be late for the train.  If you…………………………………………………………………. 19. Hurry up, or we will be late for the exam.  If we …………………………………………………………………