Cho sơ đồ của phản ứng sau :
$ F\text{e}{{(OH)}_{y}}+{{H}_{2}}S{{O}_{4}}\to F{{\text{e}}_{x}}{{(S{{O}_{4}})}_{y}}+{{H}_{2}}O $
Cặp x, y thỏa mãn là
A.2 và 3.
B.3 và 3.
C.3 và 2.
D.2 và 2.

Phương trình hóa học sau đây không cho biết điều gì?
\[ 2Al~+~3{{H}_{2}}S{{O}_{4}}\to A{{l}_{2}}{{\left( S{{O}_{4}} \right)}_{3}}+\text{ }3{{H}_{2}}\uparrow \]
A.Tỉ lệ số phân tử của $ Al:{{H}_{2}}S{{O}_{4}} $ trong phản ứng là 2:3.
B.Sản phẩm có khí $ {{H}_{2}} $.
C.Tỉ lệ số phân tử của chất tạo thành $ \text{ }A{{l}_{2}}{{\left( S{{O}_{4}} \right)}_{3}}:\text{ }{{H}_{2}} $ là 1:3.
D.Hiệu suất của phản ứng.

Phương trình hóa học nào sau đây cân bằng đúng?
A. $ 3HCl\text{ }+\text{ }Zn\text{ }\to \text{ }ZnC{{l}_{2}}+\text{ }{{H}_{2}}~. $
B. $ 2HCl\text{ }+\text{ }2Zn\text{ }\to \text{ }2ZnC{{l}_{2}}+\text{ }{{H}_{2}}. $
C. $ HCl\text{ }+\text{ }Zn\text{ }\to \text{ }ZnC{{l}_{2}}+\text{ }{{H}_{2}} $ .
D. $ 2HCl\text{ }+\text{ }Zn\text{ }\to \text{ }ZnC{{l}_{2}}+\text{ }{{H}_{2}}. $

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to the following question.
Most countries spend a large portion of their budgets ________ for their citizens.
A.provide education
B.to educational provides
C.providing education
D.education provided

Choose the word whose underlined part differs from the other three in pronunciation
A.name
B.dangerous
C.abundant
D.famous

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to the following question.
I must warn you I am not used to _______so rudely.
A.speak
B.being spoken to
C.speak to me
D.be spoken to

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to the following question.
________ research team is an effective way to prepare for class preparation of social studies such as history, geography, literature and economics.
A.Form
B.Forming
C.Forms
D.Formed

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
I clearly remember ________ you about this before.
A.telling
B.tell
C.to tell
D.being told

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
Please accept my apology. I didn’t mean ______ your birthday party last night.
A.to have missed
B.being missed
C.having missed
D.to be missed

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
Mrs. Wilkinson is very helpful in ______ books in the library that encompass the period of the Renaissance
A.will locate
B.located
C.to locate
D.locating