Q. If the pH of a solution is 11, what is the concentration of hydroxide ions [OH-] in the solution?
-
A.
1 x 10^-3 M
-
B.
1 x 10^-11 M
-
C.
1 x 10^-2 M
-
D.
1 x 10^-14 M
Solution
pOH = 14 - pH = 3, [OH-] = 10^-3 M.
Correct Answer:
C
— 1 x 10^-2 M
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Q. What is the conjugate base of sulfuric acid (H2SO4)?
-
A.
HSO4-
-
B.
SO4^2-
-
C.
H3O+
-
D.
None of the above
Solution
The conjugate base of sulfuric acid (H2SO4) is HSO4-.
Correct Answer:
B
— SO4^2-
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Q. What is the effect of adding a base to a solution of a weak acid?
-
A.
Increase in pH
-
B.
Decrease in pH
-
C.
No change in pH
-
D.
Increase in temperature
Solution
Adding a base to a weak acid will neutralize some of the acid, increasing the pH.
Correct Answer:
A
— Increase in pH
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Q. What is the effect of adding a base to a solution of hydrochloric acid?
-
A.
Increase in pH
-
B.
Decrease in pH
-
C.
No effect
-
D.
Formation of salt only
Solution
Adding a base to hydrochloric acid will neutralize it, resulting in an increase in pH.
Correct Answer:
A
— Increase in pH
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Q. What is the effect of adding a base to an acidic solution?
-
A.
Increase in pH
-
B.
Decrease in pH
-
C.
No effect
-
D.
Formation of salt only
Solution
Adding a base to an acidic solution increases the pH, making it less acidic.
Correct Answer:
A
— Increase in pH
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Q. What is the effect of adding a strong acid to a solution of a weak base?
-
A.
Increase in pH
-
B.
Decrease in pH
-
C.
No effect
-
D.
Increase in conductivity
Solution
Adding a strong acid to a weak base will decrease the pH of the solution.
Correct Answer:
B
— Decrease in pH
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Q. What is the formula for calculating the concentration of hydrogen ions in a solution from its pH?
-
A.
[H+] = 10^-pH
-
B.
[H+] = pH/10
-
C.
[H+] = 10^pH
-
D.
[H+] = pH^10
Solution
The concentration of hydrogen ions is calculated using [H+] = 10^-pH.
Correct Answer:
A
— [H+] = 10^-pH
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Q. What is the formula for calculating the concentration of hydrogen ions in a solution with a pH of 5?
-
A.
1 x 10^-5 M
-
B.
1 x 10^-7 M
-
C.
1 x 10^-9 M
-
D.
1 x 10^-3 M
Solution
The concentration of hydrogen ions is calculated as [H+] = 10^-pH = 10^-5 M.
Correct Answer:
A
— 1 x 10^-5 M
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Q. What is the formula for calculating the normality of a solution?
-
A.
N = M x n
-
B.
N = M / n
-
C.
N = M + n
-
D.
N = M - n
Solution
Normality (N) is calculated as the molarity (M) multiplied by the number of equivalents (n).
Correct Answer:
A
— N = M x n
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Q. What is the formula for calculating the pH of a solution?
-
A.
pH = log[H+]
-
B.
pH = -log[H+]
-
C.
pH = [H+]
-
D.
pH = 14 - pOH
Solution
The formula for calculating pH is pH = -log[H+].
Correct Answer:
B
— pH = -log[H+]
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Q. What is the pH of a solution with a hydrogen ion concentration of 1 x 10^-7 M?
Solution
pH = -log[H+] = -log(1 x 10^-7) = 7.
Correct Answer:
A
— 7
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Q. What is the primary product when an acid reacts with a metal carbonate?
-
A.
Salt
-
B.
Water
-
C.
Carbon dioxide
-
D.
All of the above
Solution
The reaction produces a salt, water, and carbon dioxide.
Correct Answer:
D
— All of the above
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Q. What is the primary product when sodium bicarbonate reacts with hydrochloric acid?
-
A.
Sodium chloride
-
B.
Carbon dioxide
-
C.
Water
-
D.
All of the above
Solution
The reaction produces sodium chloride, carbon dioxide, and water.
Correct Answer:
D
— All of the above
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Q. What is the result of mixing equal volumes of 0.1 M HCl and 0.1 M NaOH?
-
A.
pH < 7
-
B.
pH = 7
-
C.
pH > 7
-
D.
Cannot be determined
Solution
Mixing equal volumes of 0.1 M HCl and 0.1 M NaOH results in a neutral solution with pH = 7.
Correct Answer:
B
— pH = 7
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Q. Which of the following compounds is a weak acid?
-
A.
Hydrochloric acid
-
B.
Nitric acid
-
C.
Acetic acid
-
D.
Sulfuric acid
Solution
Acetic acid (CH3COOH) is a weak acid that does not completely dissociate in solution.
Correct Answer:
C
— Acetic acid
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Q. Which of the following indicators is suitable for a strong acid-strong base titration?
-
A.
Methyl orange
-
B.
Phenolphthalein
-
C.
Bromothymol blue
-
D.
Litmus
Solution
Bromothymol blue changes color at a neutral pH, making it suitable for strong acid-strong base titrations.
Correct Answer:
C
— Bromothymol blue
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Q. Which of the following indicators is used to determine the endpoint of a strong acid-strong base titration?
-
A.
Methyl orange
-
B.
Phenolphthalein
-
C.
Bromothymol blue
-
D.
Litmus
Solution
Phenolphthalein is commonly used for strong acid-strong base titrations as it changes color at pH 8.2-10.
Correct Answer:
B
— Phenolphthalein
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Q. Which of the following indicators would be suitable for a strong acid-strong base titration?
-
A.
Methyl orange
-
B.
Phenolphthalein
-
C.
Bromothymol blue
-
D.
Litmus
Solution
Bromothymol blue is suitable for strong acid-strong base titrations as it changes color around pH 7.
Correct Answer:
C
— Bromothymol blue
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Q. Which of the following indicators would be suitable for a titration between a strong acid and a strong base?
-
A.
Methyl orange
-
B.
Phenolphthalein
-
C.
Litmus
-
D.
Bromothymol blue
Solution
Phenolphthalein is suitable as it changes color around pH 7-10, which is ideal for strong acid-strong base titrations.
Correct Answer:
B
— Phenolphthalein
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Q. Which of the following is a characteristic of a basic solution?
-
A.
Sour taste
-
B.
Turns blue litmus red
-
C.
Slippery feel
-
D.
Reacts with metals to produce hydrogen gas
Solution
Basic solutions feel slippery due to the presence of hydroxide ions.
Correct Answer:
C
— Slippery feel
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