Trong mỗi ý a), b), c), d) ở mỗi câu, thi sinh chọn đúng hoặc sai.

Trong công nghiệp sản xuất Na, quá trình điện phân được thực hiện trong bình điện phân Downs với hỗn hợp nóng chảy ở 600 – 650°C gồm NaCl và CaCl₂ theo tỉ lệ khối lượng tương ứng khoảng 3 : 2. Hiệu điện thế trong bình điện phân được duy trì trong khoảng 6 – 7 V, thu được kim loại tinh khiết ở cathode. Cường độ dòng điện chạy qua chất điện li nóng chảy từ 20 – 40 kA. Cho nhiệt độ nóng chảy của NaCl và CaCl₂ lần lượt là 801°C và 772°C.

 a). Nếu tăng diện tích bề mặt các điện cực và tăng cường độ dòng điện tương ứng sẽ giúp làm tăng sản lượng Na.

 b). Nếu sử dụng MgCl₂ (có nhiệt độ nóng chảy là 714°C) thay thế cho CaCl₂ trong quá trình trên sẽ đạt hiệu quả sản xuất tốt hơn.

 c). Một trong các vai trò của CaCl₂ là giúp giảm nhiệt độ nóng chảy khi điện phân.

 d). Quá trình sản xuất Na cũng đồng thời thu được khí Cl₂ ở anode.

Sự gia tăng về quy mô sản lượng của một nền kinh tế trong một thời kì nhất định so với thời kì gốc được gọi là

Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions 6-10.

Except for a few unfortunate individuals, no law in this world can go against the fact that for most of us our family is an essential part of our lives. The moment you enter this cruel world, where each man is for himself, there are some near and dear ones out there who will do anything to ensure your happiness.

We are nothing more than a vulnerable and fragile object, without someone taking care of us on our arrival in this world. Despite all the odds, your family will take care of your well-being, and try their best to provide you the greatest comforts in the world. No one out there, except your family must forgive the endless number of mistakes you may make in your life. Apart from teaching you forgive and forget lessons, they-are always there for you, when you need them the most.

Family is the only place where children study a lot after school. In school, teachers teach children about the subjects which will help them to find a good job in future. But at home, parents teach children about good habits. They are not only the elements which help the children to shape their personalities but they also prepare them a sustainable and bright future.

A good family makes a greater society. Father, mother, children have to work in order to build a strong family. If any one of them fail, the whole family may collapse. The good name of the whole family can be ruined by a single member of the family. In order to avoid that unhappy scenario, every family member has to work hard and try their best. As a result, they will set good examples lor the whole society. Families impacts very much on society and societies create countries.

Trong mỗi ý a), b), c), d) ở mỗi câu, thí sinh chọn đúng hoặc sai.

Read the following passage about love and mark the letter A, B, C, or D to indicate the best answer to each of the following questions from 23 to 30.  

Love in 36 questions

Although couples will rarely believe it, scientific factors have a lot to do with falling in love. Research has shown that scent plays an important role in choosing a mate. Other experiments have demonstrated that love is caused by combinations of chemicals in the brain. Furthermore, New York psychologist Arthur Aron applied the principles of science to demonstrate that the process of falling in love could be speeded up to just 45 minutes!

Some scientists claim that we take between 90 seconds and four minutes to determine if we’re attracted to someone. However, the leap from being attracted to someone to falling in love with them is a big one, and Aron wanted to find out if the closeness associated with feelings of being in love could be created artificially.

Aron produced a paper that included 36 questions designed to encourage intimacy if couples answered them together. The questions came in three sets with each set covering increasingly intimate ground. They covered many personal opinions and experiences; for example, “Would you like to be famous?”, “What does friendship mean to you?” and “When did you last cry in front of another person?”. After answering the questions together, the couples were directed to stare into each other’s eyes for four minutes without saying anything.

Aron tested his questions on pairs of strangers and then asked them to stare at each other. All of the participants reported feeling close to their partners and many of them swapped contact details after the experiment. So if you’re keen on someone and would like to get closer to them, it would seem that Aron’s questions could help you to achieve your objective.