text stringlengths 74 5k | input_ids listlengths 57 3.45k | attention_mask listlengths 57 3.45k |
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<s> Chọn đáp án đúng với câu hỏi: Mark the letter A, B, C or D on your answer sheet to indicate the word that differs from the rest in the pronunciation of the underlined part in each of the following questions.
A. occa s ion
B. immer s ion
C. confu s ion
D. explo s ion Đáp án là: B. immer s ion </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Theo học thuyết tiến hóa tổng hợp hiện đại, phát biểu nào sau đây đúng khi nói về chọn lọc tự nhiên?
A. Chọn lọc tự nhiên không bao giờ đào thải hết alen trội gây chết ra khỏi quần thể
B. Chọn lọc tự nhiên thực chất là quá tri... | [
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<s> Chọn đáp án đúng với câu hỏi: Trong một quần xã sinh vật, xét các loài sau: cỏ, thỏ, mèo rừng, hươu, hổ, vi khuẩn gây bệnh ở thỏ và sâu ăn cỏ. Trong các nhận xét sau đây về mối quan hệ giữa các loài trên, có bao nhiêu nhận xét đúng? 1. Thỏ và vi khuẩn là mô... | [
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439,
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31500,
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29876... | [
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<s> Chọn đáp án đúng với câu hỏi: Cho B là trung điểm của AC. Tích vô hướng giữa AB→ và CA→ là số...
A. dương;
B. âm;
C. 0;
D. nguyên dương. Đáp án là: B. âm; </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hướng tiến công của Mĩ trong cuộc hành quân chiến lược “Lam sơn 719” là
A. Đông Nam Bộ.
B. Liên khu V.
C. Đường 9 – Nam Lào.
D. Dương Minh Châu. Đáp án là: C. Đường 9 – Nam Lào. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho biết tổng số electron trong ion AB 3 2- là 42. Biết số electron nguyên tử A bằng 2 lần số electron nguyên tử B. Trong các hạt nhân nguyên tử nguyên tố A cũng như nguyên tố B số hạt proton bằng số hạt notron. Tổng số hiệu nguyên tu... | [
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<s> Chọn đáp án đúng với câu hỏi: Có 3 viên bi màu xanh và 7 viên bi màu đỏ vậy phân số chỉ số viên bi màu xanh so với tổng số viên bi là:
A. 3/10
B. 7/10
C. 3/7
D. 7/3 Đáp án là: A. 3/10 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: “Học tập lịch sử chỉ diễn ra ở trong các lớp học và khi chúng ta còn là học sinh, sinh viên”. Đây là quan điểm
A. đúng, vì chỉ học sinh và sinh viên mới cần học tập lịch sử.
B. đúng, vì đây là môn học bắt buộc ở trường phổ thôn... | [
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<s> Chọn đáp án đúng với câu hỏi: Đoạn mạch điện xoay chiều MQ và giản đồ vecto điện áp của đoạn mạch MP được biểu diễn như hình vẽ. Biết MN = 4 cm, NH = 3 cm. Điện trở thuần r của cuộn dây có giá trị bằng
A. 1,33R
B. 0,75R
C. R
D. 0,5R Đáp án là: B. 0,75R </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ở Đông Nam Á, trong năm 1930, các đảng cộng sản ra đời ở
A. Việt Nam, Cam-pu-chia, Lào, Phi-líp-pin
B. Việt Nam, In-đô-nê-xi-a, Cam-pu-chia, Lào
C. Việt Nam, Lào, Cam-pu-chia, Miến Điện
D. Việt Nam, Mã Lai, Xiêm, Phi-líp-pin Đáp án là: D. Việt Nam, ... | [
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<s> Chọn đáp án đúng với câu hỏi: Độ dài các cạnh của một hình chữ nhật là:
x = 12,5 m ± 0,02 m
y = 15,46 m ± 0,05 m
Tính diện tích của hình chữ nhật trên.
A. = 193,249 ± 0,9332 (m^2);
B. = 193,25 ± 0,9342 (m^2);
C. = 193,25 ± 0,9352 (m^2);
D. = 193,25 ± 0,9332 (m^2). Đáp án là: C. = 193,25 ± 0,9352 (m^2); </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Today, many job _______ use social networking sites to reach employers.
A. graduates
B. spectators
C. judges
D. Seekers Đáp án là: D. Seekers </s> | [
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<s> Chọn đáp án đúng với câu hỏi: I would like to have my house by ___________, so we can see the beach from my window.
A. the mountains
B. the city
C. the sea
D. the countryside Đáp án là: C. the sea </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Sự truyền nhiệt là:
A. Sụ chuyển hóa năng lượng từ dạng này sang dạng khác
B. Sự truyền trực tiếp nội năng từ vật này sang vật khác
C. Sự chuyển hóa năng lượng từ nội năng sang dạng khác
D. Sự truyền trực tiếp nội năng ... | [
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302,
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1... |
<s> Chọn đáp án đúng với câu hỏi: Đoạn mạch nối tiếp AB gồm điện trở R =100Ω, cuộn dây thuần cảm có L=2/ π H nối tiếp và tụ điện có điện dung C = 0,1 π mF. Nối AB với máy phát điện xoay chiều một pha gồm 10 cặp cực (điện trở trong không đáng kể). Khi roto của má... | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Điện phân dung dịch AgNO 3 với điện cực trơ, sau một thời gian thu được dung dịch X chứa 2 chất tan có cùng nồng độ (mol/lít), và thấy khối lượng dung dịch giảm đi 9,28 gam so với ban đầu. Cho tiếp 2,8 gam bột Fe vào dung dịch X, thu đu... | [
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347,
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27... | [
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<s> Chọn đáp án đúng với câu hỏi: Trong phản ứng hóa học giữa khí H 2 và CuO ở nhiệt độ cao đã xảy ra
A. sự oxi hóa H 2 tạo thành H 2 O.
B. sự khử H 2 tạo thành H 2 O.
C. sự oxi hoá CuO tạo ra Cu.
D. sự phân hủy CuO thành Cu. Đáp án là: A. sự oxi hóa H 2 tạo thành H 2 O. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions. One of the best ways to learn about different kinds of habitats is to go to your local zoo. Zoos are usually set up by habitat. African animals are often together. Elep... | [
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7523,
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322,
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278,
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319,
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350,
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<s> Chọn đáp án đúng với câu hỏi: Cân bằng PTHH và tính tổng hệ số của các các chất trong PTHH là: M n O 2 + H C l → M n C l 2 + C L 2 + H 2 O
A. 2
B. 3
C. 4
D. 5 Đáp án là: C. 4 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nguyên nhân làm cho tháng mưa lớn nhất ở Nam Bộ nước ta đến muộn hơn so với Bắc Bộ là
A. vị trí Nam Bộ xa chí tuyến Bắc và gần Xích đạo hơn.
B. gió mùa Tây Nam kết thúc hoạt động ở Nam Bộ muộn hơn.
C. dải hội tụ nhiệt đơ... | [
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<s> Chọn đáp án đúng với câu hỏi: Máy cơ đơn giản nào sau đây không thể làm thay đổi đồng thời cả độ lớn và hướng của lực?
A. Ròng rọc cố định.
B. Ròng rọc động.
C. Mặt phẳng nghiêng.
D. Đòn bẩy. Đáp án là: A. Ròng rọc cố định. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Kết quả phép tính : 3/5 : 4 là
A. 5/12
B. 12/20
C. 3/20
D. 12/15 Đáp án là: C. 3/20 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Mỹ và Liên Xô chính thức tuyên bố chấm dứt chiến tranh lạnh trong bối cảnh quan hệ quốc tế như thế nào?
A. Mỹ và Liên Xô suy yếu về mọi mặt.
B. Xu thế hòa bình đối thoại ngày càng chiếm ưu thế.
C. Tây Âu, Nhật Bản vươn lên ... | [
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185... | [
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<s> Chọn đáp án đúng với câu hỏi: What does the passage mainly discuss?
A. How the immune system of animals and the defense mechanisms of plants differ
B. How plant defense mechanisms function
C. Theories on active plant defense mechanisms
D. The success of parasites in resisting plant defense mechanisms Đáp án là: A. ... | [
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<s> Chọn đáp án đúng với câu hỏi: Helen and Mary are talking about Mary’s result at school. - Helen: “Your parents must be proud of your result at school!” -Mary: “_______.”
A. Thanks. It’s certainly encouraging
B. I’m glad you like it
C. Sorry to hear that
D. Of course Đáp án là: A. Thanks. It’s certainly encouraging ... | [
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<s> Chọn đáp án đúng với câu hỏi: Có bốn ống nghiệm đựng các hỗn hợp sau: 1) Benzen + phenol 2) Anilin + dung dịch H 2 SO 4 (lấy dư) 3) Anilin + dung dịch NaOH 4) Anilin + nước. Hãy cho biết trong ống nghiệm nào có sự tách lớp
A. 3, 4
B. 1, 2, 3
C. 1, 4
D. Chỉ có 4 Đáp án là: A. 3,... | [
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<s> Chọn đáp án đúng với câu hỏi: Trong Chiến tranh thế giới thứ hai đã diễn ra hội nghị nào ở Liên Xô của các nước Đồng minh?
A. Hội nghị Pốt-xđam
B. Hội nghị I-an-ta
C. Hội nghị Mát-xcơ-va
D. Hội nghị Man-ta Đáp án là: B. Hội nghị I-an-ta </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ví dụ nào sau đây minh họa cho kiểu biến động không theo chu kỳ?
A. Chim cu gáy xuất hiện nhiều vào thời gian thu hoạch lúa, ngô.
B. Cá cơm ở vùng biển Pêru giảm mạnh số lượng khi có dòng nước nóng chảy về
C. Muỗi thường có nhiề... | [
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<s> Chọn đáp án đúng với câu hỏi: Phương trình √(x+2)=√(8−x) có tập nghiệm là :
A.S=(1)
B.S=(3)
C.S=(4)
D.S=(2) Đáp án là: B.S=(3) </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cách mạng Cu-ba năm 1959, dưới sự lãnh đạo của Phiđen Cátxtơrô nhằm chống chính sách thực dân mới của Mĩ ở Cu-ba, đó là
A. chống chiến tranh xâm lược của Mĩ ở Cu-ba.
B. chống chế độ độc tài Batixta thân Mĩ.
C. chống chính sách b... | [
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<s> Chọn đáp án đúng với câu hỏi: Trong nhiều trường hợp, từ Hán Việt dùng để làm gì?
A. Tạo sắc thái trang trọng, thể hiện thái độ tôn kính
B. Tạo sắc thái tao nhã, tránh gây cảm giác thô tục, ghê sợ
C. Tạo sắc thái cổ, phù hợp với bầu không khí xã hội xa ... | [
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<s> Chọn đáp án đúng với câu hỏi: Our plans to expand went by the ______ for lack of funding.
A. pack
B. board
C. path
D. stage Đáp án là: B. board </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho điểm M(3;2;-1), điểm M'(a;b;c) đối xứng của M qua trục Oy, khi đó a + b + c bằng:
A. 6
B. 4
C. 0
D. 2 Đáp án là: C. 0 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong trường hợp nào sau đây xuất hiện điện từ trường?
A. Êlectron chuyển động trong dây dẫn thẳng
B. Êlectron chuyển động trong ống dây điện
C. Êlectron trong đèn hình vô tuyến đến và va chạm vào màn hình
D. Êlectron chuyển động ... | [
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<s> Chọn đáp án đúng với câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions from 1 to 2.
A. bl oo d
B. p oo l
C. f oo d
D. t oo l Đáp án là: A. bl oo d </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Xét tính đồng biến, nghịch biến của hàm số y = –0,5x. Khẳng định nào sau đây là sai:
A. Hàm số đồng biến trên khoảng (0; 10);
B. Hàm số nghịch biến trên khoảng (–1; 5);
C. Hàm số nghịch biến trên khoảng (–5; –2022);
D. Hàm số nghịch biến trên khoảng (100; 10000). Đáp án là: A. Hàm số đ... | [
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<s> Chọn đáp án đúng với câu hỏi: Thành phần dân tộc theo dân số ở Việt Nam hiện nay được chia thành mấy nhóm?
A. Hai nhóm.
B. Ba nhóm.
C. Bốn nhóm.
D. Năm nhóm. Đáp án là: A. Hai nhóm. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: pH của dung dịch Ba(OH) 2 0,05M là.
A. 13
B. 12
C. 1
D. 11 Đáp án là: A. 13 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Mark the letter A, B, C or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.
A. books
B. tickets
C. parents
D. clothes Đáp án là: D. clothes </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho đoạn mạch AB gồm điện trở thuần R, cuộn cảm thuần có độ tự cảm L và tụ điện có điện dung C mắc nối tiếp; trong đó R và C không đổi còn L thay đổi được. Đặt vào hai đầu đoạn mạch một điện áp xoay chiều u = U 2 cos ω t + φ 0,... | [
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<s> Chọn đáp án đúng với câu hỏi: My uncle sometimes.... to the radio
A. listen
B. listens
C. listened
D. is listening Đáp án là: B. listens </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Xét một quần thể thực vật có cấu trúc là 0,25 AA :0,5 Aa : 0,25 aa. Nếu tiến hành tự thụ phấn bắt buộc thì tỷ lệ kiểu gen Aa ở thế hệ F 2 là
A. 12,5%.
B. 25%.
C. 75%.
D. 87,5%. Đáp án là: A. 12,5%. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Điểm cực Bắc của nước ta nằm ở xã
A. Đất Mũi.
B. Vạn Thạnh.
C. Lũng Cú.
D. Sín Thầu. Đáp án là: C. Lũng Cú. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: (Sở giáo dục và đào tao tỉnh Nam Định) Kim loại nào sau đây tác dụng rõ rệt với nước ở nhiệt độ thường?
A. Fe.
B. Ag.
C. Na.
D. Cu. Đáp án là: A. Fe. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Dãy gồm các ion cùng tồn tại trong một dung dịch là:
A. K + ; Ba 2+ ; Cl − và NO 3 −.
B. Cl − ; Na + ; NO 3 − và Ag +.
C. K + ; Mg 2+ ; OH − và NO 3 −.
D. Cu 2+ ; Mg 2+ ; H + và OH −. Đáp án là: A. K + ; Ba 2+ ; Cl − và NO 3 −. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Chất hữu cơ là:
A. hợp chất khó tan trong nước.
B. hợp chất của cacbon và một số nguyên tố khác trừ N, Cl, O
C. hợp chất của cacbon trừ C O, C O 2, H 2 C O 3, muối cacbonat, muối cacbua và xianua.
D. hợp chất có nhiệt độ sôi cao. Đáp ... | [
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<s> Chọn đáp án đúng với câu hỏi: Tại sao người mắc bệnh xơ vữa thành mạch lại thường bị cao huyết áp?
A. Có nhịp tim nhanh nên bị cao huyết áp
B. Vì khả năng hấp thụ chất dinh dưỡng kém dễ gây thiếu máu nên thường bị cao huyết áp
C. Tạo ra sức cản của thành m... | [
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<s> Chọn đáp án đúng với câu hỏi: Cho hai biểu thức A=(4x^2y^2)^2(xy^3)^3; B=(x^2y^3)^2. Khi đó A : B bằng
A. 16x^4y^6;
B. 8x^3y^8;
C. 4x^3y^7;
D. 16x^3y^7. Đáp án là: D. 16x^3y^7 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: My friend has lost weight and is much ______ than last year.
A. thin
B. the thinnest
C. thiner
D. thinner Đáp án là: D. thinner </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Văn minh Trung Hoa thời kì cổ - trung đại gắn liền với những con sông nào?
A. Hắc Long và Mê Công.
B. Hoàng Hà và Trường Giang.
C. Dương Tử và Mê Công.
D. Hắc Long và Trường Giang. Đáp án là: B. Hoàng Hà và Trường Giang. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Bộ máy chính quyền dưới thời nhà Nguyễn ở Việt Nam ngày càng hoàn chỉnh từ thời
A. Nguyễn Ánh đến Thiệu Trị
B. Nguyễn Ánh đến Minh Mạng
C. Minh Mạng đến Tự Đức
D. Tự Đức đến Hiệp Hòa Đáp án là: B. Nguyễn Ánh đến Minh Mạng </... | [
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<s> Chọn đáp án đúng với câu hỏi: Cho các chất: metyl fomat, anđehit axetic, saccarozơ, axit fomic, glucozơ, axetilen, etilen. Số chất cho phản ứng tráng bạc là
A. 4
B. 3
C. 5
D. 2 Đáp án là: A. 4 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trật tự thế giới mới theo khuôn khổ quyết định Hội nghị I-an-ta gồm những nước nào?
A. Liên Xô, Anh. Pháp, Mĩ.
B. Liên Xô, Mĩ, Anh.
C. Liên Xô, Anh, Pháp. Mĩ. Trung Quốc.
D. Anh, Pháp, Mĩ. Đáp án là: B. Liên Xô, Mĩ, Anh. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Lựa chọn đáp án đúng nhất:Biết (2x+3)^2−(2x+1)(2x−1)=22, giá trị của x là:
A. 0
B. 1
C. 2
D. 3 Đáp án là: B. 1 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong một quần thể bướm sâu đo bạch dương (P) có cấu trúc di truyền là: 0,25AA: 0,5Aa: 0,25aa = 1 (A qui định cánh đen và a qui định cánh trắng). Nếu những con bướm cùng màu chỉ thích giao phối với nhau và quần thể không chịu sự tác đ... | [
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1,
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1,
1,
1,
1,
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1... |
<s> Chọn đáp án đúng với câu hỏi: Trong thí nghiệm giao thoa ánh sáng bằng hai khe sáng hẹp. Nguồn phát đồng thời hai bức xạ có bước sóng λ 1 = 0, 6 μ m (màu cam) và λ 2 = 0, 42 μ m (màu tím). Tại vạch sáng gần nhất cùng màu với vạch sáng trung tâm là vị trí vân sáng bậc... | [
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<s> Chọn đáp án đúng với câu hỏi: Thủy tức sinh sản bằng cách nào?
A. Mọc chồi
B. Sinh sản hữu tính
C. Tái sinh
D. Tất cả A, B, C đều đúng Đáp án là: D. Tất cả A, B, C đều đúng </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Vị trí vân sáng trong thí nghiệm giao thoa của I-âng được xác định bằng công thức nào sau đây?
A. x = λD a
B. x = ( k + 0, 5 ) λD a
C. x = k λD a
D. x = k aD λ Đáp án là: C. x = k λD a </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hai vật A, B dán liền nhau m B = 2m A = 200g, treo vào một lò xo có độ cứng k = 50N/m, có chiều dài tự nhiên 30cm. Nâng vật theo phương thẳng đứng đến vị trí lò xo có chiều dài tự nhiên rồi buông nhẹ. Vật dao động điều hòa đến vị ... | [
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<s> Chọn đáp án đúng với câu hỏi: Hỗn hợp X gồm 2 este no, đơn chức mạch hở. Cho 0,25 mol X tác dụng với dung dịch AgNO 3 trong NH 3 dư, đun nóng thu được 21,6 gam Ag. Mặt khác, cho 14,08 gam X tác dụng với dung dịch NaOH vừa đủ thu được hỗn hợp 2 muối của 2 axit cacboxylic đo... | [
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<s> Chọn đáp án đúng với câu hỏi: Phát biểu nào sau đây không đúng khi nói về các nguyên tố hóa học có trong tế bào?
A. Có khoảng 25 nguyên tố có vai trò quan trọng đối với sự sống.
B. C, H, O, N là những nguyên tố hóa học chính trong tế bào.
C. Các nguyên tố khác nh... | [
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<s> Chọn đáp án đúng với câu hỏi: I saw a flying overhead.
A. train
B. helicopter
C. conveyor belt
D. coach Đáp án là: B. helicopter </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho a, b, x, y là các số thực dương khác 1. Khẳng định nào sau đây đúng?
A. log_yx=(log_ax)/(log_ay)
B. log_a1/(x)=1/(log_ax)
C. log_a(x+y)=log_ax+log_ay
D. log_xb=log_ba.log_ax Đáp án là: A. log_yx=(log_ax)/(log_ay) </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Vị trí gần trung tâm châu Âu. Pháp tiếp giáp với biển nào sau đây?
A. Biển Bắc, Biển Măng-sơ và Địa Trung Hải.
B. Biển Địa Trung Hải và Biển Đỏ.
C. Biển Măng-sơ và Biển Bắc.
D. Biển Đen và biển Măng-sơ. Đáp án là: A. Biển Bắc, Bie... | [
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<s> Chọn đáp án đúng với câu hỏi: Nghiệm của phương trình cot^23x−cot3x−2=0 là
A. x=((π)/4+k(π)/31/3arccot2+k(π)/3),k∈Z.
B. x=(−(π)/4+k(π)/3−1/3arccot2+k(π)/3),k∈Z.
C. x=((π)/4+kπ1/3arccot2+k(π)/3),k∈Z.
D. x=((π)/4+kπ1/3arccot2+kπ),k∈Z. Đáp án là: A. x=((π)/4+k(π)/31/3arccot2+k(π)/3),k∈Z. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hỗn hợp khí X gồm một ankan và một anken. Tỉ khối của X so với H 2 bằng 11,25. Đốt cháy hoàn toàn 4,48 lít X, thu được 6,72 lít CO 2 (các thể tích khí đo ở đktc). Công thức của ankan và anken lần lượt là:
A. CH 4 và C 2 H 4
B. C 2 H 6 va... | [
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<s> Chọn đáp án đúng với câu hỏi: Thể tích dung dịch HNO 3 1M loãng ít nhất cần dùng để hòa tan hoàn toàn một hỗn hợp gồm 0,15 mol Fe và 0,15 mol Cu là: (Biết phản ứng tạo chất khử duy nhất là NO):
A. 1,0 lít
B. 0,6 lít
C. 0,8 lít
D. 1,2 lít Đáp án là: C. 0,8 lít </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Chọn phát biểu sai?
A. Tháng 2 có 30 ngày
B. Tháng 4 có 30 ngày
C. Tháng 7 có 31 ngày
D. Tháng 12 có 31 ngày Đáp án là: A. Tháng 2 có 30 ngày </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Cho 6,15 gam hỗn hợp Y gồm HCOOH, CH 3 COOH, C 6 H 5 OH tác dụng vừa đủ với 400 ml dung dịch NaOH 1,5M. Cô cạn dung dịch sau phản ứng thu được m gam hỗn hợp muối khan. Giá trị của m là
A. 14,7.
B. 13,61.
C. 24,78.
D. 19,35. Đáp án là: D. 19,35 </s> | [
1,
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29945,
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5089,
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1,
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1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Một đám nguyên từ hiđrô đang ở trạng thái kích thích mà êlectron chuyển động trên quỹ đạo dừng N. Khi các êlectron chuyển về các quỹ đạo dừng bên trong thì quang phổ vạch phát xạ của đám nguyên tử đó có bao nhiêu vạch?
A. 10.
B. 4.
C. ... | [
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302,
25... | [
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1,
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1,
1,
1,
1,
1,
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: X là hợp chất hữu cơ mạch hở có công thức phân tử C 8 H 15 O 4 N. Đúng nóng 0,1 mol X cần dùng dung dịch chứa 0,2 mol NaOH, thu được một muối Y và một ancol Z. Lấy toàn bộ Z đem đốt cháy, thu được 17,6 gam CO 2 và 10,8 gam H 2 O. Công th... | [
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865,
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274,
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298,
228,
190,
146,
29875,
29901,
1060,
425,
30712,
5089,
207,
158,
31214,
29886,
10329,
31500,
30103,
... | [
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1,
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1,
1,
1,
1,
1,
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Cho các phản ứng : - Số phản ứng tạo ra C 2 H 5 Br là:
A. 4
B. 3
C. 2
D. 1 Đáp án là: B. 3 </s> | [
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1,
1,
1,
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Các sự kiện phát sinh cây hạt trần và cây hạt kín lần lượt xảy ra ở các kỉ nào sau đây?
A. Kỉ Cacbon và kỉ Phấn trắng.
B. Kỉ Silua và kỉ Triat.
C. Kỉ Cacbon và kỉ Triat.
D. Kỉ Silua và kỉ Phấn trắng. Đáp án là: A. Kỉ Cacbon và kỉ Phấn ... | [
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413,
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2... | [
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1,
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1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: So với những truyện cổ dân gian đã học, em có nhận xét về phương thức miêu tả trong truyện "Ông lão đánh cá và con cá vàng"?
A. Không xuất hiện
B. Xuất hiện ít hơn
C. Xuất hiện nhiều hơn
D. Tương tự như ở những truyện khác Đ... | [
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865,
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992,
207,
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302,
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207,
158,
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865,... | [
1,
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1,
1,
1,
1,
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1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Hiện tuợng nào dưới đây không tuân theo định luật bảo toàn năng lượng
A. Bếp nguội đi khi tắt lửa
B. Xe dừng lại khi tắt máy
C. Bàn là nguội đi khi tắt điện
D. Không có hiện tượng nào Đáp án là: D. Không có hiện tượng nào </s> | [
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1... | [
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1,
1,
1,
1,
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1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: The word “It” in line 7 means _
A. The greenhouse effect
B. Australia
C. The forest destruction
D. The World Wildlife Fund Đáp án là: D. The World Wildlife Fund </s> | [
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1... | [
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1,
1,
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1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Tia alpha không có đặc điểm nào dưới đây?
A. Là dòng các hạt nhân nguyên tử Hêli H 4 2 e
B. Đi qua điện trường giữa hai bản của tụ điện tia α bị lệch về phía bản âm
C. Có khả năng đâm xuyên mạnh nên được sử dụng để chữa bệnh un... | [
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865,
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323,
423,
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1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Lũy thừa bậc n của số tự nhiên a được viết là:
A. a^n;
B. a.n;
C. a + n;
D. a – n. Đáp án là: A. a^n; </s> | [
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1,
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289,
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30... | [
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1,
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1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Một hộp chứa 10 quả cầu đỏ được đánh số từ 1 tới 10 và 20 quả cầu xanh được đánh số từ 11 tới 30. Lấy hai quả bất kì trong hộp. Có bao nhiêu cách lấy được hai quả cầu có số chẵn?
A. 210 (cách).
B. 55 (cách).
C. 50 (cách).
D. 105 (cách). Đáp án là: D. 105 (cách) </s> | [
1,
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29886,
29871,
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1,
1,
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1... |
<s> Chọn đáp án đúng với câu hỏi: Gió mùa mùa đông là sự hoạt động mạnh mẽ của gió có hướng
A. Tây Nam.
B. Đông Bắc.
C. Tây Bắc.
D. Đông Nam. Đáp án là: A. Tây Nam. </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Benzen + X → etylbenzen. Vậy X là:
A. axetilen.
B. etilen.
C. etyl clorua.
D. etan. Đáp án là: B. etilen. </s> | [
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2256,
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1,
1,
1,
1,
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1... |
<s> Chọn đáp án đúng với câu hỏi: “Em bé đánh que diêm thứ tư, em bé "nhìn thấy rõ ràng bà em đang mỉm cười với em". Khi em đánh tiếp những que diêm còn lại trong bao diêm, em thấy bà em to lớn và đẹp lão, bà em cầm lấy tay em, hai bà cháu vụt bay lên chầu Thượng đế" ... | [
1,
1,
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678,
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29871,
1715,
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865,
325,
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29875,
274,
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298,
228,
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29875,
29901,
1346,
6026,
367,
30103,
29871,
30128,
29874,
30103,
29876,
29882,
712... | [
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Cho 27,48 gam axit picric vào bình kín dung tích 20 lít rồi nung nóng ở nhiệt độ cao để phản ứng xảy ra hoàn toàn thu được hỗn hợp khí gồm CO 2, CO, N 2 và H 2. Giữ bình ở 1223 0 C thì áp suất của bình là P atm. Giá trị của P là
A. 7,724... | [
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11... | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Cho x = 10 – y. Khi đó khẳng định nào sau đây là đúng khi nói về giá trị của biểu thức N = x^3 + 3x^2y + 3xy^2 + y^3 + x^2 + 2xy + y^2
A. N > 1200
B. N < 1000
C. N < 0
D. N > 1000 Đáp án là: D. N > 1000 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Thực hiện phép tính (-7)/3:14/9 ta được kết quả là :
A. 2/17
B. (-98)/27
C. -3/2
D. 5/2 Đáp án là: C. -3/2 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho hình chóp tứ giác đều S.ABCD. Số mặt phẳng qua điểm S cách đều các điểm A, B, C, D là
A. 4
B. 2
C. 3
D. 1 Đáp án là: C. 3 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Find the word which has a different sound in the part underlined.
A. b o ttle
B. tut o r
C. c o st
D. s o rry Đáp án là: B. tut o r </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Phương trình đường thẳng d có hệ số góc bằng 5 và đi qua điểm A(-1;1) là:
A. y=5x−6.
B. y=5x+6.
C. y=5x+4.
D.y=5x−4. Đáp án là: B. y=5x+6. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho các số thập phân sau: 17,95; – 19,57; – 51,09; 9,57; – 7,059. Sắp xếp các số thập phân đó theo thứ tự từ lớn đến bé là
A. 17,95; 9,57;– 19,57; – 7,059; – 51,09;
B. 17,95; 9,57; – 51,09; – 19,57; – 7,059;
C. 17,95; 9,57; – 7,059; – 19,57; – 51,09;
D. 17,95; 9,57; – 7,059; – 51,09; –... | [
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<s> Chọn đáp án đúng với câu hỏi: My friend and I _______ your sister tomorrow afternoon after she _______ her work.
A. will meet-will finish
B. will meet-has finished
C. will have met-has finished
D. will have met-will finish Đáp án là: B. will meet-has finished </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho 7,8 gam hỗn hợp Mg, Al tác dụng hết với dung dịch HCl dư sau phản ứng thấy khối lượng dung dịch tăng thêm 7 gam. Tính số mol HCl đã tham gia phản ứng.
A. 0,8 mol;
B. 0,4 mol;
C. 0,3 mol;
D. 0,25 mol. Đáp án là: A. 0,8 mol; </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Số thích hợp để điền vào chỗ chấm: 3,25 giờ =............... phút là
A. 32,5
B. 195
C. 315
D. 3250 Đáp án là: B. 195 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Độ tan của một chất trong nước ở nhiệt độ xác định là
A. số gam chất đó có thể tan trong 100 gam dung dịch ;
B. số gam chất đó có thể tan trong 100 gam nước ;
C. số gam chất đó có thể tan trong 100 gam dung môi để tạo thành dung dịch... | [
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<s> Chọn đáp án đúng với câu hỏi: Cho điểm M(-2;4), khi đó:
A. OM→=-2i→+4j→
B. OM→=2i→-4j→
C. OM→=2j→-4i→
D. OM→=-2i→-4j→ Đáp án là: A. OM→=-2i→+4j→ </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nội dung nào sau đây phản ánh đúng ý nghĩa quốc tế từ sự ra đời của Liên bang Cộng hoà xã hội chủ nghĩa Xô viết?
A. Làm thất bại ý đồ và hành động chia rẽ của các thế lực thù địch.
B. Cổ vũ phong trào giải phóng dân tộc của ... | [
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<s> Chọn đáp án đúng với câu hỏi: Trong các phát biểu sau, phát biểu nào sai?
A. Ròng rọc cố định chỉ có tác dụng đổi hướng của lực và cho ta lợi về công
B. Ròng rọc động cho ta lợi hai lần về lực, thiệt hai lần về đường đi, không cho ta lợi về công
C. Mặt pha... | [
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29875,
29901,
1605,
549,
5777,
30103,
29883,
1374,
29874,
30103,
29873,
289,
347,
... | [
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Tần số góc trong dao động điều hòa có đơn vị
A. m/s
B. Hz
C. rad.s
D. rad/s Đáp án là: D. rad/s </s> | [
1,
1,
29871,
678,
30975,
29876,
29871,
30128,
29976,
29886,
29871,
1715,
29871,
30128,
30030,
865,
325,
31280,
29875,
274,
30057,
29884,
298,
228,
190,
146,
29875,
29901,
10523,
31500,
30712,
29876,
577,
31500,
30103,
748,
30103,
29883,
534... | [
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: We didn’t go by air because we didn’t have enough money.
A. If we would go by air, we had enough money.
B. We would gone by air if we had enough money.
C. We had had enough money if wewould have gone by air.
D. We would have gone by air if we had had enough money Đáp án là: D. We would... | [
1,
1,
29871,
678,
30975,
29876,
29871,
30128,
29976,
29886,
29871,
1715,
29871,
30128,
30030,
865,
325,
31280,
29875,
274,
30057,
29884,
298,
228,
190,
146,
29875,
29901,
1334,
3282,
30010,
29873,
748,
491,
4799,
1363,
591,
3282,
30010,
2... | [
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Gọi S là tập hợp tất cả các giá trị nguyên của tham số m để đường thẳng d:y=-x+m cắt đồ thị hàm số y=(-2x+1)/(x+1) tại hai điểm phân biệt A, B sao cho AB≤2√(2). Tổng giá trị tất cả các phần tử của S bằng:
A. -6
B. 0
C. 9
D. -27 Đáp án là: A. -6 </s> | [
1,
1,
29871,
678,
30975,
29876,
29871,
30128,
29976,
29886,
29871,
1715,
29871,
30128,
30030,
865,
325,
31280,
29875,
274,
30057,
29884,
298,
228,
190,
146,
29875,
29901,
402,
30975,
29875,
317,
18916,
260,
31142,
29886,
298,
31645,
29886,
... | [
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Nobody‟s got to stay late this evening, _______?
A. is it
B. have they
C. isn’t it
D. don’t they Đáp án là: B. have they </s> | [
1,
1,
29871,
678,
30975,
29876,
29871,
30128,
29976,
29886,
29871,
1715,
29871,
30128,
30030,
865,
325,
31280,
29875,
274,
30057,
29884,
298,
228,
190,
146,
29875,
29901,
15706,
1486,
229,
131,
162,
29879,
2355,
304,
7952,
5683,
445,
1100... | [
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
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