Cho lưu huỳnh tác dụng với dung dịch kiềm nóng: 3S + 6KOH 2K2S + K2SO3 + 3H2O. Trong phản ứng trên, S thể hiện tính chất gì? (xác định số oxi hóa của S) A. Tính oxi hóa B. Tính khử C. Vừa oxi hóa, vừa khử D. Không thể hiện tính oxi hóa và tính khử *Nhớ xác định số oxi hoá của S giúp mình

Các câu hỏi liên quan

III. Choose the best answer ( A, B, C or D) 1. She ................... to the radio in the morning. A. listen B. watches C. listens D. sees 2. My friend ................... English on Monday and Friday. A. not have B. isn't have C. don't have D. doesn't have 3. I am ..........., so I don't want to eat any more. A. hungry B. thirsty C. full D. small 4. Last Sunday we................in the sun, we ẹnjoyed a lot. A. had fun B. have great fun C. have funs D. had having great funs 5. I'm going to the .................... now. I want to buy some bread. A. post office B. drugstore C. bakery D. toy store 6. Another word for "table tennis"............................. A. badminton B. ping-pong C. football D. volleyball 7. The opposite of "weak" is .................................... A. thin B. small C. strong D. heavy 8. How............is it from here to Hanoi? A. often B. far C. many D. much 9. Where...................you yesterday? I was at home. A. was B. are C. were D. is 10. What is the third letter from the end of the English alphabet? A. X B. Y C. W D. V 11. ................... you like to drink coffee? Yes, please. A. What B. Would C. Want D. How 12. I often watch football matches..............Star Sports Channel. A. on B. in C. at D. of 13. What about ................. to Hue on Sunday? A. to go B. go C. going D. goes 14. I...............go swimming because I can't swim A. often B. never C. usually D. sometimes 15. His mother bought him ........... uniform yesterday A. a B. an C. the D. two 16. The story is so uninteresting, it means that the story is......................... A. nice B. exciting C. funny D. boring 17. My school ...... three floors and my classroom is on the first floor. A. have B. has C. are D. is 18. His mother is a doctor. She works in a ...................... A. hospital B. post office C. restaurant D. cinema 19. He often travels......................car...........................my father. A. by/ for B. by/ with C. with/ by D. for / by 20. I ask my mother to..............my dog when I am not at home A. see B. look after C. look at D. take of