Cho các cân bằng hóa học sau:

( a )   H 2 ( k ) + I 2 ( k ) ⇌ 2 HI ( k ) ( b )   2 NO 2 ( k ) ⇌ N 2 O 4 ( k ) ( c )   N 2 ( k ) + 3 H 2 ( k ) ⇌ 2 NH 3 ( k ) ( d )   2 SO 2 ( k ) + O 2 ( k ) ⇌ 2 SO 3 ( k )

Ở nhiệt độ không đổi, khi thay đổi áp suất chung của mỗi hệ cân bằng, cân bằng hóa học nào ở trên không bị chuyển dịch?

A. (a).

B. (c).

C. (b).

D. (d).

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

He is a very intelligent boy; _____________ , he sometimes gets bad marks.

A. otherwise

B. so

C. however

D. thus

Khi được chiếu sáng, hiđrocacbon nào sau đây tham gia phản ứng thế với clo theo tỉ lệ mol 1:1, thu được nhiều dẫn xuất monoclo là đồng phân cấu tạo của nhau nhất

A. butan

B. neopentan

C. pentan

D. isopentan

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

The (A) average salt (B) content of seawater is (C) more than three (D) percents.

A. average 

B. content 

C. more than 

D. percent

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

It is (A) interested (B) to compare the early stylized art forms (C) of ancient civilizations (D) with the modem abstract forms of art.

A. interested 

B. to compere 

C. of 

D. with

Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions

A. machine

B. confine

C. engine

D. entail

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 23 to 27. Fill in the appropriate word in question 25

  One of the greatest concerns parents have when facing an international move is “What schooling will be available to my child? Will my child be disadvantaged academically as a result of this move?” (23) _____________ this fear is certainly strongest in families moving overseas for the first time, even those who may be more experienced often have concerns about their children’s education.

  Dr. Ernest Mannino, Director of the State Department’s Office of Overseas Schools, and Dr. Keith Miller, Deputy Director of the office, spoke candidly (24) _____________ some of the common concerns parents have regarding the education of their children. Dr. Mannino and Dr. Miller (25)____________ parents against making assumptions about their children’s education. To make an educated choice, parents need to (26)____________ through schooling issues and to research post schools as far in advance of a move as possible.

  Children (27) _____________ are internationally mobile have many choices of schools to attend. In most major cities, there are schools based on the U.S., French, German, and British systems. Some parents also choose to become their children’s teachers through home education. Which school is appropriate for your child is an individual decision based on many factors.

A. discourage

B. caution

C.oppose

D. approve

Cho các phản ứng sau:

(a)  C   +   H 2 O → t

(b) Si + dung dịch NaOH  →

(c) FeO + CO → t

(d)  O 3 + A g →

(e)  C u N O 3 2 → t

(f)  K M n O 4 → t

Số phản ứng sinh ra đơn chất là

A. 4

B. 3

C. 5

D. 6

Hợp chất A tạo bởi ion M 2 + và ion X 2 - . Tổng số hạt cơ bản tạo nên trong hợp chất A là 241 trong đó tổng số hạt mang điện nhiều hơn số hạt không mang điện là 47. Tổng số hạt mang điện của ion M 2 +  nhiều hơn của ion X 2 -  là 76 hạt. Vị trí của M trong bảng tuần hoàn là

A. Ô 12, chu kỳ 3, nhóm IIA

B. Ô 20, chu kỳ 4, nhóm IIA

C. Ô 56, chu kỳ 6, nhóm IIA

D. Ô 38, chu kỳ 5, nhóm IIA