Cho 0,88 gam hỗn hợp X gồm hai kim loại A và B (A và B đều có hoá trị 2) hoà tan hoàn toàn vào dung dịch HCl dư thu được 672ml khí (đktc) . Cô cạn dung dịch sau phản ứng thu được m (g) muối khan a,Xác định M b,Xác định A và B nếu chúng là hai kim loại liên tiếp trong PNC nhóm 2

Các câu hỏi liên quan

I/ Choose the word that has the underlined (letters) pronounced differently from the others. 1 A. ready B. peasant C. death D. scream 2. A. Lovely B. Garden C. Cousin D. Much 3. A. Man B. Handbag C. Bad D. Far 4. A. scream B. death C. ready D. peasant 5. A. traveled B. stared C. landed D. seemed II/ Choose the one word or phrase - a, b, c or d - that best completes the sentence or substitutes for the underlined word or phrase. 6 . John isn't contented with his present salary. A. excited about B. satisfied with C. disappointed about D. interested in 7.We had a nice chat over a cup of tea. A. talk in a friendly way B. study C. learn D. discuss 8. We've given up..................... to persuade them A. trying/ changing B. trying/ to change C. to try/ changing D. try/ to change 9. It was the most............... experience of my life. A. frighten B. frightening C. frightened D. frightful 10. Everyday my mother…………up at 6 am A. gets B. get C. got D. is getting 11. Last night, there……….a very interesting film on TV A. is B. was C. are D. were 12. After she had had lunch, she…….to bed A. go B. goes C. went D. gone 13. Mr. An stopped………3 years ago A. smoke B. to smoke C. smoking D. smokes 14. “…….does Lam go to work?” “By car” A. when B. what C. where D. how 15. “………………..do you like to learn English? “ Because it’s an international language” A. Where B. When C. Why D. How 16. We …………………….dinner at home on Tuesdays A. don’t have B. didn’t have C. is having D. will have 17. ………….. do you live? – In a flat, near the university. A. Where B. When C. Who D .Whom 18. Mai is interested ....... talking an art course. A. on B. with C. in D. of 19. Mary………………………….late for the class. A. sometimes is B. had sometimes been C. is sometimes D. sometimes was 20. Marie kept in the mind to be a scientist A. determined B. worked C. harbored D. developed