Cho a gam hỗ hợp X gồm glyxin, alanin và valin phản ứng với 200 ml dung dịch HCl 0,1 M, thu được dung dịch Y. Để phản ứng hết với các chất trong dung dịch Y cần 100 ml dung dịch KOH 0,55M. Đốt cháy hoàn toàn a gam hỗn hợp X, thu được hỗn hợp Z gồm CO₂, H₂O và N₂. Cho Z vào bình đựng dung dịch Ba(OH)₂ dư, thấy khối lượng bình tăng 7,445 gam. Biết các phản ứng xảy ra hoàn toàn. Giá trị của a là

A. 3,255

B. 2,135

C. 2,695

D. 2,765

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. Fill in the appropriate word in question 45

           British families started  going on holiday to the seaside around the middle of the 19^th century. The invention of the railways (45) ____ this possible. The first holidaymakers were quite rich and went for their health and education. The seaside was a place to be (46) ____  of illness, and doctors recommended bathing in the sea and drinking sea water. Also to (47) ____ their knowledge, families attended concerts and read books from the library.

          At that time, ordinary working people had very little time (48) ____ work. However, in 1871, the government introduced four ‘Banking Holiday’ - national holiday days. This (49) ____ people to have a day or two out, which now and then gave them a taste for leisure and the seaside. At first, they went on day-trips, taking (50) ____ of special cheap tickets on the railways. By the 1880s, rising incomes (51) ____ that many ordinary workers and their families could have a week’s holiday at the seaside. Rail fares were reduced and cheap hotels were built to (52) ____ them. Holidaymakers enjoyed being idle, sitting on the beach, bathing in the sea, and eating ice-cream. Cheap entertainment was (53) ____ offer and holidaymakers went to have fun.

     Today the English seaside (54) ____ popular, with more than 18 million holidays taken there each year.

A. got

B. had

C. let

D. made

Tính:

Mark the letter A, B, C or D on your answer sheet to indicate the word that differs from the pronunciation in each of the following questions.

A. amused

B. composed

C. decreased

D. advised

Hỗn hợp X gồm 1 mol amino axit no, mạch hở và 1 mol amin no, mạch hở. X có khả năng phản ứng tối đa với 2 mol HCl hoặc 2 mol NaOH. Đốt cháy hoàn toàn X thu được 6 mol CO₂, x mol H₂O và y mol N₂. Các giá trị x, y tương ứng là

A. 7 và 1,0 

B. 8 và 1,0 

C. 7 và 1,5 

D. 8 và 1,5 

Có thể phân biệt 3 dung dịch : KOH, HCl, H₂SO₄ (loãng) bằng một thuốc thử là

A. Al

B. Zn

C. BaCO₃

D. giấy quỳ tím

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

The Norman is said x England in 1066.

A. to have invaded

B. to have been invaded

C. to invade

D. to be invaded