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CHƯƠNG 1: S
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Câu 67.
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A



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8
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3
COOH 0,01M có pH = 3. Độ điện ly 2 của CH
3
COOH trong dd là
a. 0,5% b. 10% c. 2% d. 2,5%
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Câu 97 Hỗn hợp ( Mg, Al) pư với 250 ml dd hỗn hợp gồm HCl 0,2M và H
2
SO
4
0,5M. Sau pư
kết thúc thu được 4,368 lit khí ở đkc. Trong pư trên:
A. axit vừa đủ B. không xác đònh được C. axit dư D. axit thiếu
Câu 98 Dự đoán hiện tượng xảy ra khi thêm từ từ dd Na
2
CO
3
vào dd FeCl
3
:
A. có kết tủa và bọt khí B. có bọt khí C. không có hiện tượng D. có kết tủa
Câu 99 Cho m gam hỗn hợp Mg và Al vào 250 ml dd X ( HCl 1M và H
2
SO
4
0,5M) thì thu được
11,144 lit khí ở đkc và dd Y. Coi thể tích là không đổi thì dd Y có pH là:
A. 6 B. 1 C. 2 D. 7
Câu 100  Cho mẫu hợp kim Na-Ba tác dụng với nước dư thu được dd X và 3,36 lit khí ở đkc. Để
trung hoà X cần 75 ml dd H

2
SO
4
aM. Giá trò của a là:
A. 1 B. 1,5 C. 1,25 D. 2

×