Hòa tan hoàn toàn 36,8g hỗn hợp X gồm Fe, ZnO, CuO trong dung dịch HCl dư thi được dd A và 2,24 lít khí H2(đktc). Dẫn khí H2S dư vào ddA thu được 19,2g kết tủa. Nếu cho hỗn hợp X tác dụng với H2SO4 đặc nóng dư thì tạo ra V lít SO2(sản phẩm khử duy nhất, đktc). Các phản ứng xảy ra hoàn toàn. a. Tính phần trăm theo khối lượng mỗi chất trong X. b. Tính giá trị V.

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EXERCISE 4: Turn into passive 1. The waiter brings me this dish. →I…………………………………………………………………………………………………… →This dish ………………………………………………………………………………… 2. Our friends send these postcards to us. →These postsards ………………………………………………………………………………… →We…………………………………………………………………………………………… 3. Their grandmother told them this story when they visited her last week. →They………………………………………………………………………………………… →This story…………………………………………………………………………… 4. Tim ordered this train ticket for his mother. →This train ticket…………………………………………………………………………… →His mother…………………………………………………………………………… 5. You didn’t show me the special cameras. →I………………………………………………………………………………………………… → The special cameras ………………………………………………………………………… 6. She showed her ticket to the airline agent. →Her………………………………………………………………………………………… 7. He lends his friend his new shoes. →His friend…………………………………………………………………………………… → His new shoes ………………………………………………………………………………… 8. She left her relatives five million pounds. → Her relatives ………………………………………………………………………………… → Five million pounds ………………………………………………………………………… 9. Have you sent the Christmas cards to your family? → Have the Christmas ………………………………………………………………… → Has your family ………………………………………………………………… 10. They keep this room tidy all the time. →This room……………………………………………………………………………………… 11. They all voted the party a great success. →The party………………………………………………………………………………… 12. We gave Ann some bananas and some flowers. →Ann……………………………………………………………………………………… → Some bananas and some flowers …………………………………………………… 13. She bought some cups of tea to the visitors in the next room. → Some cups of tea ………………………………………………………………………… → The visitors in the next room ………………………………………………………………… 14. They find the new project worthless. → The new project …………………………………………………………………… 15. The secretary didn’t take the note to the manager. → The note …………………………………………………………………………………