Câu 6: Đốt cháy hoàn toàn m gam hỗn hợp các este no, đơn chức, mạch hở. Sản phẩm thu được dẫn vào bình đựng dung dịch nước vôi trong dư thấy khối lượng kết tủa là 4,5g. Khối lượng dung dịch sau phản ứng so với khối lượng ban đầu A. giảm 1,71g B. tăng 1,71g C. giảm 3,42g D. tăng 3,42g

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Robotic competition is an important event among students in Asia. Japan was the first country to introduce the contest to universities in the country. Since 2002 it has become a popular competition in Asia. The contest encourages the invention of robots among young people, especially students. Their robots have to do many tasks. The robot which can complete the tasks better will be the winner and become the best one. In Vietnam, people also have the same competition for students called “Robocon”. It is a TV show. Students from many universities take part in the contest and the best team with the best robot in each country will be able to attend a World Robotic Competition in a foreign host country every year. 1. Which country invented the Robotic competition? …………………………………………………………………………………………………. 2. What does the contest encourage? …………………………………………………………………………………………………. 3. What do the robots do in the contest? …………………………………………………………………………………………………. 4. Does Vietnam have a contest for students’ robots? …………………………………………………………………………………………………. 5. Who will be able to attend the world Robotic competition? ………………………………………………………………………………………………….