Tổng của hai số là 90. Số thứ nhất bằng $\frac{7}{8}$ số thứ hai. Tìm hai số đó.

Cho 3,68 gam hỗn hợp Al, Zn phản ứng với H2SO4 20% (vừa đủ); thu được 0,1 mol H2. Khối lượng thu được dung dịch sau phản ứng là  

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks:

Engineers have been dreaming of an underwater link between Britian and France since 1802. Finally, in 1994 the Channel Tunnel ( nickname ”the Chunnel” by the English) was officially opened. This fifteen million dollar project took seven years to complete. It is 50km long and built 45 metres under the seabed. The trains which go through the Chunnel can travel at up to 300km/h due to the(31)…… electrical system. The journey from London to Paris via the Chunnel takes just three hours. It is also handy for drivers since they can load their cars onto the trains. They don't need to book in(32)……… as trains depart every few minutes. However, while on the train, there isn't much to do and many criticise the Chunnel for this. Unlike the ferries, there is no duty-free shopping, no video game parlour or refreshment stand(33).……… can you look outside and enjoy the view. As a result, many would find the Chunnel(34)……and would take the ferry(35)……  

Question 31:

Tính chất hóa học chung của kim loại là :  

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks:

Engineers have been dreaming of an underwater link between Britian and France since 1802. Finally, in 1994 the Channel Tunnel ( nickname ”the Chunnel” by the English) was officially opened. This fifteen million dollar project took seven years to complete. It is 50km long and built 45 metres under the seabed. The trains which go through the Chunnel can travel at up to 300km/h due to the(31)…… electrical system. The journey from London to Paris via the Chunnel takes just three hours. It is also handy for drivers since they can load their cars onto the trains. They don't need to book in(32)……… as trains depart every few minutes. However, while on the train, there isn't much to do and many criticise the Chunnel for this. Unlike the ferries, there is no duty-free shopping, no video game parlour or refreshment stand(33).……… can you look outside and enjoy the view. As a result, many would find the Chunnel(34)……and would take the ferry(35)……  

Question 33:

Thứ tự một số cặp oxi hoá - khử trong dãy điện hoá như sau: Fe2+/Fe; Cu2+/Cu; Fe3+/Fe2+; Ag+/Ag. Cặp chất không phản ứng với nhau là  

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks:

Engineers have been dreaming of an underwater link between Britian and France since 1802. Finally, in 1994 the Channel Tunnel ( nickname ”the Chunnel” by the English) was officially opened. This fifteen million dollar project took seven years to complete. It is 50km long and built 45 metres under the seabed. The trains which go through the Chunnel can travel at up to 300km/h due to the(31)…… electrical system. The journey from London to Paris via the Chunnel takes just three hours. It is also handy for drivers since they can load their cars onto the trains. They don't need to book in(32)……… as trains depart every few minutes. However, while on the train, there isn't much to do and many criticise the Chunnel for this. Unlike the ferries, there is no duty-free shopping, no video game parlour or refreshment stand(33).……… can you look outside and enjoy the view. As a result, many would find the Chunnel(34)……and would take the ferry(35)……  

Question 32:

Dãy gồm tất cả các chất không phản ứng với HNO3 đặc nguội là              

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35:

My home is in the air – I do an enormous amount of travelling. It is a fast life and full of work, but I like it and that is the only way (31)..................me. Everything is tiring – music, travelling – but what can I do? I am not (32).................to complaining. It is hart to imagine now that I will never be very long in one place. My home town is on the Caspian Sea. There is sea, wind, sun and too many tourists and hotels. I have my own flat with four or five rooms. But I am seldom there. If I am there for a day or two I prefer to (33)................ with my mother and grandmother. They live in a small house, but it is very comfortable and my mother cooks for me. I like good, simple food. I have no wife, no brothers or sisters and my father died when I was seven. He was an engineer and I don’t ( 34).............him very well. He liked music very much and wanted me to (35)..............a musician.  

Question 31:

Lấy cùng một khối lượng ban đầu các kim loại Mg,Al,Zn,Fe cho tác dụng với dung dịch H2SO4 loãng dư. Kim loại nào giải phóng lượng khí H2 nhiều nhất ở cùng điều kiện ?

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35:

My home is in the air – I do an enormous amount of travelling. It is a fast life and full of work, but I like it and that is the only way (31)..................me. Everything is tiring – music, travelling – but what can I do? I am not (32).................to complaining. It is hart to imagine now that I will never be very long in one place. My home town is on the Caspian Sea. There is sea, wind, sun and too many tourists and hotels. I have my own flat with four or five rooms. But I am seldom there. If I am there for a day or two I prefer to (33)................ with my mother and grandmother. They live in a small house, but it is very comfortable and my mother cooks for me. I like good, simple food. I have no wife, no brothers or sisters and my father died when I was seven. He was an engineer and I don’t ( 34).............him very well. He liked music very much and wanted me to (35)..............a musician.  

Question 32: