Acids, Bases, and Electrochemistry AFCAT Questions

AFCAT Chemistry

Acids, Bases, and Electrochemistry MCQ Questions


13.
The pH of human blood is maintained close to:
A.
8.4
B.
6.4
C.
7.4
D.
7.0
😑 View Answer Rough Work Error
ANSWER :
C. 7.4
14.
The pH of a 0.1 M solution of a weak acid (Ka = 10⁻⁵) is approximately:
A.
5
B.
7
C.
1
D.
3
😑 View Answer Rough Work Error
ANSWER :
D. 3
15.
If 1 mL of 0.1 M HCl is diluted to 100 mL with water, the pH of the resulting solution is:
A.
3
B.
1
C.
4
D.
2
😑 View Answer Rough Work Error
ANSWER :
A. 3
16.
A solution has pH = 4. The hydrogen ion concentration is:
A.
10⁻¹⁰ mol/L
B.
10⁻⁴ mol/L
C.
4 mol/L
D.
10⁴ mol/L
😑 View Answer Rough Work Error
ANSWER :
B. 10⁻⁴ mol/L
17.
The relationship between pKa and Ka is:
A.
pKa = log Ka
B.
pKa = Ka × 10
C.
pKa = 1/Ka
D.
pKa = -log Ka
😑 View Answer Rough Work Error
ANSWER :
D. pKa = -log Ka
18.
Which of the following acids is the strongest?
A.
Acid with pKa = 4
B.
Acid with pKa = 10
C.
Acid with pKa = 1
D.
Acid with pKa = 7
😑 View Answer Rough Work Error
ANSWER :
C. Acid with pKa = 1