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1/Đáp án nào sau đâylà sai
A. pH = - lg[H
+
] B. [H
+
] = 10
a
thì pH = a C. pH + pOH = 14 D. [H
+
] . [OH
-
]
= 10
-14
2/Theo Bronstet, NH
4
Cl là chất nào sau đây?
A. Axit B. Bazơ C. Lỡng tính D. Trung tính
3/Theo Bronstet, dung dịch AlCl
3
có môi trờng:
A. Axit B. Bazơ C. Lỡng tính D. Trung tính
4/Muối nào sau đây không phải là muối axit?
A. NaHSO
4
B. Ca(HCO
3
)
2
C. NaHCO
3
D. Na
2
HPO
4
5/Điều nào sau đây là đúng?
A. Dung dịch FeCl
3
có pH > 7 B. Dung dịch FeCl
3
có pH = 7
C. Dung dịch FeCl
3
có pH < 7 D. Không xác định đợc
6/Cho các axit sau:
A. H
3
PO
4
(K
a
=7,6.10
-3
) B. HClO (K
a
=5.10
-8
) C. CH
3
COOH (K
a
=1,8.10
-5
) D.
HSO
4
-
(K
a
=10
-2
)
Thứ tự tăng dần tính axit của chúng đợc sắp xếp nh thế nào?
A. a < b < c < d B. d < a< c < b C. b < c < a < d D. d < c < b < a
7/Trong các muối sau, dung dịch muối nào có môi trờng trung tính? A. FeCl
3
B. Na
2
CO
3
C.
CuCl
2
D. KCl
8/Dd NaOH 0,001M có pH là bao nhiêu? A. 11 B. 12 C. 13 D. 3
9/dd thu đợc khi trộn lẫn 200 ml dd NaCl 0,2M và 300 ml dd Na
2
SO
4
0,2M có [Na
+
] là bao
nhiêu?
A. 0,32M B. 1M C. 0,2M D. 0,1M
10/Có 4 lọ đựng 4 dung dịch Al(NO
3
)
3
; NaNO
3
, Na
2
CO
3
; NH
4
NO
3
. Nếu chỉ dùng 1 thuốc thử
thì có thể dùng chất nào sau đây để nhận biết 4 lọ trên?
A. Ddịch H
2
SO
4
B. Dd Ba(OH)
2
C. Ddịch K
2
SO
4
D. CaCO
3
11/Dung dịch X gồm NaOH 0,1M và Ba(OH)
2
0,2 M. Thể tích dd H
2
SO
4
0,5 M cần để
trung hoà hết 100 ml dung dịch X là bao nhiêu? A. 100ml B. 50ml C. 150ml
D. 200 ml
12/Trong các cặp sau đây, cặp chất nào tồn tại trong dung dịch?
A. AlCl
3
và Na
2
CO
3
B. HNO
3
và NaHCO
3
C. Na
2
CO
3
và KOH D. NaCl và
AgNO
3
13/Phản ứng nào sau đây xảy ra đợc:
A. NaHSO
4
+ NaOH B. NaNO
3
+ CuSO
4
C. CuSO
4
+ HNO
3
D. KNO
3
+
Na
2
SO
4
14/Những ion nào sau đây cùng có mặt trong dung dịch:
A. Mg
2+
, SO
4
2-
, Cl
-
, Ba
2+
B. H
+
, Cl
-
, Na
+
, Al
3+
C. S
2-
, Fe
2+
, Cu
2+
, Cl
-
D. Fe
3+
, OH
-
,
Na
+
, Ba
2+
15/Thay đổi một dung dịch có pH = 4 thành dung dịch có pH = 6 ta phải:
A. Cho vào một ít nớc của dung dịch bay hơi B. Thêm vào một axit
C. Thêm vào một bazơ D. Bằng phơng pháp khác
16/Bộ ba các chất nào sau đây là chất điện ly mạnh?
A.HCl, KOH, CH
3
COONa B.KOH, NaCl, Cu(OH)
2
C.HCl, KOH, CH
3
COOH D.HCl,
" U]"STU