We have provided 50 MCQs on Acid Base Titration Unit-2, 1st semester, Pharmaceutical Analysis, B. Pharm.
We have covered following topics.
Theories of acid base indicators, classification of acid base titrations and theory involved in titrations of strong, weak, and very weak acids and bases, neutralization curves
Table of Contents
MCQ on Acid Base Titration
- Which theory of acid-base indicators suggests that indicators are weak acids or bases that undergo a color change as they lose or gain protons during a titration?
- A) Arrhenius theory
- B) Brønsted-Lowry theory
- C) Lewis theory
- D) Indicator theory
Correct Answer: B) Brønsted-Lowry theory
- According to the Brønsted-Lowry theory, an acid is defined as a substance that:
- A) Donates a proton (H⁺ ion)
- B) Accepts a proton (H⁺ ion)
- C) Releases hydroxide ions (OH⁻)
- D) Contains a metal cation
Correct Answer: A) Donates a proton (H⁺ ion)
- In an acid-base titration, which of the following indicators is commonly used to detect the endpoint when titrating a strong acid with a strong base?
- A) Phenolphthalein
- B) Bromothymol blue
- C) Methyl orange
- D) Litmus paper
Correct Answer: A) Phenolphthalein
- Which type of acid-base titration involves the direct neutralization of a strong acid with a strong base or vice versa?
- A) Strong acid-strong base titration
- B) Weak acid-weak base titration
- C) Strong acid-weak base titration
- D) Weak acid-strong base titration
Correct Answer: A) Strong acid-strong base titration
- In a strong acid-strong base titration, what is the pH at the equivalence point?
- A) pH 1
- B) pH 7
- C) pH 14
- D) pH 0
Correct Answer: B) pH 7
- In a weak acid-weak base titration, what type of indicator is often used to detect the endpoint?
- A) Phenolphthalein
- B) Bromothymol blue
- C) Universal indicator
- D) A pH meter
Correct Answer: D) A pH meter
- Which of the following is a characteristic of a very weak acid or base in an acid-base titration?
- A) It has a high pH.
- B) It requires a large volume of titrant for neutralization.
- C) It produces a sharp endpoint.
- D) It has a strong color change.
Correct Answer: B) It requires a large volume of titrant for neutralization.
- What type of titration curve is typically observed for the titration of a weak acid with a strong base?
- A) Steep and vertical
- B) Gradual and sigmoidal
- C) Horizontal
- D) Exponential
Correct Answer: B) Gradual and sigmoidal
- What does the pH at the equivalence point depend on in a weak acid-strong base titration?
- A) The concentration of the weak acid
- B) The concentration of the strong base
- C) Both the weak acid and strong base concentrations
- D) The temperature of the solution
Correct Answer: C) Both the weak acid and strong base concentrations
- What type of acid-base titration curve is expected for the titration of a weak base with a strong acid?
- A) Gradual and sigmoidal
- B) Steep and vertical
- C) Horizontal
- D) Linear
Correct Answer: A) Gradual and sigmoidal
- What type of acid-base titration curve is typically observed for the titration of a very weak acid with a strong base?
- A) Gradual and sigmoidal
- B) Steep and vertical
- C) Horizontal
- D) Linear
Correct Answer: A) Gradual and sigmoidal
- In a very weak acid-strong base titration, what is the pH at the equivalence point?
- A) pH 1
- B) pH 7
- C) pH 14
- D) pH 8
Correct Answer: D) pH 8
- Which of the following statements is true regarding the equivalence point in an acid-base titration?
- A) The pH at the equivalence point is always 7.
- B) The equivalence point is the point of maximum color change.
- C) The volume of titrant added is equal to the volume of the analyte.
- D) The equivalence point occurs when the indicator changes color.
Correct Answer: C) The volume of titrant added is equal to the volume of the analyte.
- What is the primary role of a pH indicator in an acid-base titration?
- A) To react with the analyte
- B) To neutralize the solution
- C) To detect the endpoint
- D) To accelerate the reaction
Correct Answer: C) To detect the endpoint
- Which of the following is an example of a weak acid that can be titrated with a strong base?
- A) Hydrochloric acid (HCl)
- B) Sulfuric acid (H2SO4)
- C) Acetic acid (CH3COOH)
- D) Nitric acid (HNO3)
Correct Answer: C) Acetic acid (CH3COOH)
- What is the primary objective of titrating a weak acid with a strong base in an acid-base titration?
- A) To determine the pH of the solution
- B) To quantify the concentration of the strong base
- C) To determine the dissociation constant (Ka) of the weak acid
- D) To determine the concentration of the weak acid
Correct Answer: D) To determine the concentration of the weak acid
- Which of the following statements about neutralization curves is accurate?
- A) A neutralization curve is a plot of pH versus volume of titrant added.
- B) Neutralization curves are always linear.
- C) The equivalence point is the pH at which the curve starts.
- D) Neutralization curves are not affected by the nature of the reactants.
Correct Answer: A) A neutralization curve is a plot of pH versus volume of titrant added.
- What does the equivalence point represent in an acid-base titration curve?
- A) The point where the pH is the lowest
- B) The point where the pH is the highest
- C) The point where the reaction is complete
- D) The point where the titrant is added most rapidly
Correct Answer: C) The point where the reaction is complete
- In a strong acid-strong base titration, what is the expected shape of the titration curve?
- A) Steep and vertical
- B) Gradual and sigmoidal
- C) Horizontal
- D) Exponential
Correct Answer: A) Steep and vertical
- What information does the inflection point of a neutralization curve provide?
- A) The concentration of the titrant
- B) The initial pH of the solution
- C) The endpoint of the titration
- D) The equivalence point of the reaction
Correct Answer: D) The equivalence point of the reaction
- What is the primary theory involved in the titration of a very weak base with a strong acid?
- A) Lewis theory
- B) Arrhenius theory
- C) Bronsted-Lowry theory
- D) Henderson-Hasselbalch theory
Correct Answer: A) Lewis theory
- Which of the following statements is true about the behavior of pH during a strong acid-strong base titration?
- A) The pH increases gradually before the equivalence point.
- B) The pH decreases gradually after the equivalence point.
- C) The pH remains constant at 7 throughout the titration.
- D) The pH exhibits a sharp increase at the endpoint.
Correct Answer: C) The pH remains constant at 7 throughout the titration.
- What is the primary objective of titrating a strong acid with a strong base in an acid-base titration?
- A) To determine the pH of the solution
- B) To quantify the concentration of the strong base
- C) To neutralize the solution
- D) To determine the concentration of the strong acid
Correct Answer: D) To determine the concentration of the strong acid
- In a weak acid-strong base titration, what type of indicator is often used to detect the endpoint?
- A) Phenolphthalein
- B) Methyl orange
- C) Bromothymol blue
- D) Litmus paper
Correct Answer: A) Phenolphthalein
- What is the primary role of an acid-base indicator in an acid-base titration?
- A) To react with the analyte
- B) To accelerate the reaction
- C) To detect the endpoint
- D) To neutralize the solution
Correct Answer: C) To detect the endpoint
- Which of the following is a characteristic of a very weak base in an acid-base titration?
- A) It requires a large volume of titrant for neutralization.
- B) It has a high pH.
- C) It produces a sharp endpoint.
- D) It requires a small volume of titrant for neutralization.
Correct Answer: A) It requires a large volume of titrant for neutralization.
- In a very weak base-strong acid titration, what is the pH at the equivalence point?
- A) pH 1
- B) pH 7
- C) pH 14
- D) pH 0
Correct Answer: A) pH 1
- Which of the following statements about titration curves is accurate?
- A) The inflection point of the curve is always at the equivalence point.
- B) A titration curve is a plot of volume of titrant versus pH.
- C) The endpoint and equivalence point are the same in all titration curves.
- D) A vertical region on the curve represents rapid titrant addition.
Correct Answer: D) A vertical region on the curve represents rapid titrant addition.
- What does the endpoint represent in an acid-base titration curve?
- A) The point where the reaction is complete
- B) The point where the pH is the highest
- C) The point where the pH is the lowest
- D) The point where the titrant is added most slowly
Correct Answer: A) The point where the reaction is complete
- In a weak base-weak acid titration, what is the expected shape of the titration curve?
- A) Steep and vertical
- B) Gradual and sigmoidal
- C) Horizontal
- D) Exponential
Correct Answer: B) Gradual and sigmoidal
- Which of the following statements is true about the behavior of pH during a strong base-weak acid titration?
- A) The pH increases gradually before the equivalence point.
- B) The pH decreases gradually after the equivalence point.
- C) The pH remains constant at 7 throughout the titration.
- D) The pH exhibits a sharp increase at the endpoint.
Correct Answer: A) The pH increases gradually before the equivalence point.
- What is the primary objective of titrating a weak base with a strong acid in an acid-base titration?
- A) To determine the pH of the solution
- B) To quantify the concentration of the strong acid
- C) To neutralize the solution
- D) To determine the concentration of the weak base
Correct Answer: D) To determine the concentration of the weak base
- In a strong base-strong acid titration, what type of indicator is commonly used to detect the endpoint?
- A) Phenolphthalein
- B) Methyl orange
- C) Bromothymol blue
- D) Litmus paper
Correct Answer: B) Methyl orange
- What is the primary role of a pH meter in an acid-base titration?
- A) To react with the analyte
- B) To accelerate the reaction
- C) To detect the endpoint
- D) To measure the pH continuously
Correct Answer: D) To measure the pH continuously
- In a strong base-weak acid titration, what is the expected shape of the titration curve?
- A) Steep and vertical
- B) Gradual and sigmoidal
- C) Horizontal
- D) Exponential
Correct Answer: B) Gradual and sigmoidal
- Which of the following is a characteristic of a very weak acid in an acid-base titration?
- A) It requires a small volume of titrant for neutralization.
- B) It has a high pH.
- C) It produces a sharp endpoint.
- D) It requires a large volume of titrant for neutralization.
Correct Answer: A) It requires a small volume of titrant for neutralization.
- In a very weak acid-strong base titration, what is the pH at the equivalence point?
- A) pH 1
- B) pH 7
- C) pH 14
- D) pH 8
Correct Answer: D) pH 8
- What is the primary theory involved in the titration of a weak acid with a weak base?
- A) Arrhenius theory
- B) Lewis theory
- C) Bronsted-Lowry theory
- D) Henderson-Hasselbalch theory
Correct Answer: D) Henderson-Hasselbalch theory
- What does the equivalence point represent in an acid-base titration curve?
- A) The point where the reaction is complete
- B) The point where the pH is the highest
- C) The point where the pH is the lowest
- D) The point where the titrant is added most slowly
Correct Answer: A) The point where the reaction is complete
- What is the primary objective of titrating a weak acid with a weak base in an acid-base titration?
- A) To determine the pH of the solution
- B) To quantify the concentration of the weak acid
- C) To neutralize the solution
- D) To determine the concentration of the weak base
Correct Answer: B) To quantify the concentration of the weak acid
- Which of the following indicators is often used in the titration of a weak acid with a strong base to maintain a relatively stable pH during the titration process?
- A) Phenolphthalein
- B) Methyl orange
- C) Bromothymol blue
- D) A buffer solution
Correct Answer: D) A buffer solution
- What is the primary objective of using a buffer solution in a weak acid-strong base titration?
- A) To accelerate the reaction
- B) To maintain a constant pH
- C) To detect the endpoint
- D) To neutralize the solution
Correct Answer: B) To maintain a constant pH
- Which type of acid-base titration typically exhibits a gradual change in pH around the equivalence point?
- A) Strong acid-strong base titration
- B) Weak acid-weak base titration
- C) Strong acid-weak base titration
- D) Weak acid-strong base titration
Correct Answer: B) Weak acid-weak base titration
- In a weak base-weak acid titration, how does the pH change around the equivalence point?
- A) It remains constant at 7.
- B) It exhibits a steep increase.
- C) It decreases gradually.
- D) It increases gradually.
Correct Answer: A) It remains constant at 7.
- Which theory of acid-base indicators suggests that they function by changing color as they undergo a proton transfer reaction during the titration?
- A) Arrhenius theory
- B) Brønsted-Lowry theory
- C) Lewis theory
- D) Indicator theory
Correct Answer: B) Brønsted-Lowry theory
- In a strong acid-strong base titration, what is the expected pH at the endpoint?
- A) pH 1
- B) pH 7
- C) pH 14
- D) pH 0
Correct Answer: B) pH 7
- Which of the following statements is true regarding the behavior of pH during a weak base-strong acid titration?
- A) The pH increases gradually before the equivalence point.
- B) The pH decreases gradually after the equivalence point.
- C) The pH remains constant at 7 throughout the titration.
- D) The pH exhibits a sharp decrease at the endpoint.
Correct Answer: D) The pH exhibits a sharp decrease at the endpoint.
- What is the primary role of an indicator in an acid-base titration?
- A) To react with the analyte
- B) To accelerate the reaction
- C) To detect the endpoint
- D) To neutralize the solution
Correct Answer: C) To detect the endpoint
More MCQs
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