Khử hoàn toàn 20,46g hỗn hợp gồm CuO và PbO bằng khí CO ở nhiệt độ cao. Toàn bộ khí sinh ra có hàm lượng nguyên tố Oxi bằng lượng Oxi thu được khi nung hoàn toàn 69,52g KMnO4. Viết PTHH và tính % khối lượng các oxit kim loại trong hỗn hợp ban đầu.

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I. Find the word which has a different sound in the part underlined. 1. A. actor B. guitarist C. attract D. gallery 2. A. musical B. delicious C. special D. physician 3. A. aunt B. sauce C. caught D. daughter 4. A. culture B. chapter C. feature D. literature 5. A. emperor B. recognition C. tablet D. temple II. Choose the best answer (A, B, C or D). 1. My cousin – Hoa, is the same age…………………. me. A. as B. of C. to D. like 2. My brother’s taste in art is quite different …………………. mine. A. to B. as C. from D. then 3. Tan Ky House in Hoi An …………………….. over two hundred years ago. A. build B. is built C. is to built D. was built 4. How many …………….. do you need? A. yogurt B. carton of yogurt C. packet of yogurt D. cartons of yogurt 5. …………….. water should I put into the glass? A. How B. What C. How many D. How much 6. Many kinds of fruits and vegetables …………… at the floating market in Can Tho. A. sell B. will sell C. are sold D. are selling 7. There is ……………….tofu, but there aren’t ……………..sandwiches. A. some – some B. any – any C. any – some D. some – any 8. Cakes in Viet Nam are made ………………..butter, eggs and flour. A. in B. from C. by D. of 9. I never watch ballet, and my sister doesn’t ………………………. A. so B. too C. either D. like that 10. Classical music is not …………………as pop music. A. exciting B. as exciting C. as excited D. more excited III. Complete the questions with “How much” or “How many”. 1. ………………………………. text messages do you send a day? 2. ………………………………. money have you got in your pocket? 3. ………………………………. sleep do you get a night? 4. ………………………………. time is there to the end of the lesson? 5. ………………………………. cousins have you got? 6. ………………………………. packets of biscuits do you eat a week? 7. ………………………………. people are there in this classroom? 8. ………………………………. homework do you do a day? IV. Put the verbs in brackets in the correct verb forms. 1. A new high school (build)…………………………………in our town next year 2. A painting by Picasso (sell) ……………………..for 3 million dollars last year. 3. Tickets for the football match (sell) ………………………………at the ticket booth 4. Harvard (consider)…………………………………….the oldest university in the USA 5. My Son Sanctuary (locate) …………………………..in Duy Xuyen District, Quang Nam Province 6. Some flowers (buy) ………………………for his mother on her birthday yesterday. 7. Sydney Opera House in Australia (finish) …………………………………in 1973. 8. The students in that university (teach) ……………………………….by famous professors and lecturers 9. Huong Pagoda Festival (visit) ………………………………by thousands of tourist during the first three months of the Lunar New Year 10. The site for Huong Pagoda (discover) ……………………..about 2000 years ago. Tặng vote 5 sao và cảm ơn cùng vs trả lời hay nhất cho ai trả lời nhanh , đúng và đầy đủ nhất