Cho 52,8 gam hỗn hợp rắn X gồm Fe₃O₄, Cu(NO₃)₂ và Cu vào dung dịch chứa 0,6 mol H₂SO₄, đun nóng sau khi kết thúc phản ứng phản ứng thu được khí NO (sản phẩm khử duy nhất) và dung dịch Y chỉ chứa 2 muối có khối lượng m gam. Cho bột Cu vào dung dịch Y không thấy có hiện tượng. Giá trị m là:

A. 79,6

B. 94,8

C. 78,8

D. 52,8

Mark the letter A,B,C or D on your answer sheet to show the underlined part that needs correction in each of the following questions.

(A) A number of large insurance companies (B) has (C) their headquarters in the (D) capital city.

A. A number

B. has

C. their headquarters

D.capital city

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word for each of the blanks from 35 to 44.

WHY I DISLIKE COMPUTERS

Almost everyone says that computers are wonderful and that they are (35) ______ our lives for the better by making everything faster and more reliable, but I am not so sure that this is the (36) ________

The other day I was standing in a large department store waiting to pay for a couple of films for my camera (37) _______ the assistant announced that the computer which controlled the till (38) _______ working. I did not think this was a big problem and I (39)________ to find another counter, but of course, all the machines are part of the same system. So there we were: a shop full of customers, money at the ready, waiting to (40) _______ our purchases, but it was quite clear that none of the assistants knew what to do. They were not allowed to take our money and give to customers a written (41) ______,because the sales wouldn‟t then have been recorded on the computer system. In the end, (42) _______many other people, I left my shopping on the counter and walked out .Don't you think so that's ridiculous? It (43) ________ never have happened before computers, and that, for me, is the problem: we are beginning to depend on these machines so completely that we (44) _______ cannot manage without them anymore.

Điền vào ô 36

A. truth 

B. case 

C. reality 

D. practice

The bank won’t lend you the money without some_________ that you will pay it back.

A. profit

B. guarantee

C. charge

D. interest

The mother said by her_________ child’s beside all night.

A. asleep

B. sleep

C. sleeping

D. overslept

X là peptit mạch hở (được tạo bởi Gly, Ala và Val), Y là chất béo rắn. Hỗn hợp E chứa X, Y với tỷ lệ mol tương ứng là 2:1. Đun nóng m gam E trong 110 ml dung dịch NaOH 1M vừa đủ thu được bốn muối Z và glixerol. Đốt cháy hoàn toàn E cần dùng vừa đủ 1,115 mol O₂. Sản phẩm cháy thu được có chứa 0,04 mol N₂, a mol CO₂ và b mol H₂O. Giá trị của b là?

A. 0,63

B. 0,77

C. 0,80

D. 0,71