Acids, Bases, and Electrochemistry AFCAT Questions

AFCAT Chemistry

Acids, Bases, and Electrochemistry MCQ Questions


7.
The pH of a solution is 5. What is the hydroxide ion concentration?
A.
10⁻⁷ M
B.
10⁻⁵ M
C.
10⁻⁹ M
D.
10⁻¹⁴ M
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ANSWER :
C. 10⁻⁹ M
8.
The pH of 10⁻⁸ M HCl solution is approximately:
A.
8
B.
6
C.
6.98
D.
7
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ANSWER :
C. 6.98
9.
Equal volumes of pH 3 and pH 5 strong acid solutions are mixed. The pH of the resulting solution is approximately:
A.
3.3
B.
3.0
C.
4.0
D.
5.0
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ANSWER :
A. 3.3
10.
Which of the following solutions is the most acidic?
A.
Solution with pH = 7
B.
Solution with pH = 10
C.
Solution with pH = 2
D.
Solution with pH = 5
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ANSWER :
C. Solution with pH = 2
11.
The value of Kw at 25°C is:
A.
1 × 10⁻¹²
B.
1 × 10⁻⁷
C.
1 × 10⁻¹⁰
D.
1 × 10⁻¹⁴
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ANSWER :
D. 1 × 10⁻¹⁴
12.
As temperature increases, the pH of pure water:
A.
Becomes acidic
B.
Remains exactly 7
C.
Increases above 7
D.
Decreases below 7 but water remains neutral
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ANSWER :
D. Decreases below 7 but water remains neutral