Chất nào sau đây có tính lưỡng tính?
A. $ NaHC{{O}_{3}} $ .
B. $ Al{{\left( N{{O}_{3}} \right)}_{3}} $ .
C.Al.
D. $ MgC{{l}_{2}} $ .

Hợp chất nào của nhôm tác dụng với dung dịch NaOH (theo tỉ lệ mol 1 : 1) cho sản phẩm \(Na\left[ {Al{{\left( {OH} \right)}_4}} \right]\)?
A.\(Al{\left( {OH} \right)_3}\).
B.\(Al{\left( {N{O_3}} \right)_3}\).
C.\(AlC{l_3}\).
D.\(A{l_2}{\left( {S{O_4}} \right)_3}\).

Hợp chất $ Al{{\left( OH \right)}_{3}} $ tan được trong dung dịch
A. $ KCl. $
B. $ NaOH. $
C. $ KN{{O}_{3.}} $
D. $ NaCl. $

Mark the letter A, B, C or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in the following question
After the live concert, the audience was invited to write in with their ideas.
A.people who sponsor the concert
B.people who watch the concert
C.people who produce the concert
D.people who perform in the concert

Nhôm không tan trong dung dịch nào sau đây?
A.\(N{H_3}\).
B.\({H_2}S{O_4}\).
C.\(NaHS{O_4}\).
D.HCl.

Thành phần chính của phèn chua có chứa muối
A. $ C{{r}_{2}}{{\left( S{{O}_{4}} \right)}_{3}}. $
B. $ F{{e}_{2}}{{\left( S{{O}_{4}} \right)}_{3}}. $
C. $ AlC{{l}_{3}}. $
D. $ A{{l}_{2}}{{\left( S{{O}_{4}} \right)}_{3}}. $

Choose the answer A, B, C or D to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in the following sentence
This publisher reduced the number of print newspapers and books each week and put more informatio
A.rose
B.increased
C.decreased
D.fell

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
It’s not easy to find that restaurant just by street name. You’ d better use a(n)___________ app to make it easier.
A.interactive
B.audio
C.GPS
D.record

Choose the answer A, B, C or D to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in the following sentence
Facebook has helped me keep in touch with my friends and family even when I’m abroad.
A.put up with
B.lose touch with
C.keep track of
D.catch up with

Mark the letter A, B, C or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in the following question
My idol has made an important impact on my career choice.
A.affection
B.role
C.influence
D.pressure