Acids, Bases, and Electrochemistry AFCAT Questions

AFCAT Chemistry

Acids, Bases, and Electrochemistry MCQ Questions


1.
What is the pH of a 0.001 M HCl solution at 25°C?
A.
2
B.
1
C.
11
D.
3
😑 View Answer Rough Work Error
ANSWER :
D. 3
2.
The pH of a 0.01 M NaOH solution is:
A.
14
B.
10
C.
12
D.
2
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ANSWER :
C. 12
3.
If the [H⁺] of a solution is 1 × 10⁻⁵ M, what is its pH?
A.
9
B.
10⁻⁵
C.
4
D.
5
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ANSWER :
D. 5
4.
The pH of pure water at 25°C is exactly 7 because:
A.
Water contains no ions
B.
Water is neutral by definition
C.
[H⁺] = [OH⁻] = 10⁻⁷ M
D.
Kw = 10⁻⁷
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ANSWER :
C. [H⁺] = [OH⁻] = 10⁻⁷ M
5.
What is the pOH of a solution whose pH is 3.5?
A.
3.5
B.
7.0
C.
11.5
D.
10.5
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ANSWER :
D. 10.5
6.
When the pH of a solution changes from 4 to 6, the H⁺ ion concentration:
A.
Increases 100 times
B.
Remains the same
C.
Decreases 2 times
D.
Decreases 100 times
😑 View Answer Rough Work Error
ANSWER :
D. Decreases 100 times