We have provided 60 MCQs on Diazotization Titration, Unit-3, 1st semester, Pharmaceutical Analysis, B. Pharm.
We have coverd following topics.
Basic Principles,methods and application of diazotisation titration.
Table of Contents
MCQ on Diazotization Titration
What is the fundamental principle behind diazotization titration?
- A) Precipitation of insoluble salts
- B) Formation of colored complexes
- C) Conversion of primary aromatic amines to diazonium salts
- D) Neutralization of acidic solutions
Correct Answer: C) Conversion of primary aromatic amines to diazonium salts
Which reagent is commonly used to convert primary aromatic amines to diazonium salts in diazotization titration?
- A) Sodium hydroxide (NaOH)
- B) Sulfuric acid (H2SO4)
- C) Sodium nitrite (NaNO2)
- D) Potassium permanganate (KMnO4)
Correct Answer: C) Sodium nitrite (NaNO2)
In diazotization titration, what type of compounds can be titrated using this method?
- A) Alkyl halides
- B) Primary alcohols
- C) Primary aromatic amines
- D) Carboxylic acids
Correct Answer: C) Primary aromatic amines
What is the primary role of hydrochloric acid (HCl) in diazotization titration?
- A) To form a colored complex
- B) To neutralize the solution
- C) To promote the formation of diazonium salts
- D) To precipitate insoluble salts
Correct Answer: C) To promote the formation of diazonium salts
In diazotization titration, what type of indicator is commonly used to detect the endpoint of the titration?
- A) pH indicator
- B) Conductivity indicator
- C) Redox indicator
- D) Starch indicator
Correct Answer: A) pH indicator
What is the color change observed at the endpoint of diazotization titration when using a pH indicator like phenolphthalein?
- A) From pink to colorless
- B) From yellow to red
- C) From blue to green
- D) From orange to violet
Correct Answer: A) From pink to colorless
In which type of titration is diazotization titration most commonly used?
- A) Acid-base titration
- B) Redox titration
- C) Complexometric titration
- D) Precipitation titration
Correct Answer: A) Acid-base titration
What is the primary application of diazotization titration in analytical chemistry?
- A) Estimation of chloride ions
- B) Determination of vitamin C concentration
- C) Quantification of primary aromatic amines
- D) Identification of metal cations
Correct Answer: C) Quantification of primary aromatic amines
Which of the following substances is often used as a standard solution in diazotization titration for calibration?
- A) Potassium permanganate (KMnO4)
- B) Sodium chloride (NaCl)
- C) Sodium nitrite (NaNO2)
- D) Sulfuric acid (H2SO4)
Correct Answer: C) Sodium nitrite (NaNO2)
In diazotization titration, what happens to the diazonium salt solution when it reaches the endpoint?
- A) It becomes colorless.
- B) It turns red.
- C) It forms a precipitate.
- D) It becomes alkaline.
Correct Answer: A) It becomes colorless.
What is the key reaction involved in diazotization titration when primary aromatic amines are converted into diazonium salts?
- A) Esterification
- B) Halogenation
- C) Diazotization
- D) Hydrolysis
Correct Answer: C) Diazotization
In diazotization titration, which factor is essential for achieving accurate results?
- A) High temperature
- B) Neutral pH
- C) Precise temperature control
- D) Absence of moisture
Correct Answer: C) Precise temperature control
When performing diazotization titration, why is it important to work quickly and avoid exposure to light?
- A) To prevent the formation of precipitates
- B) To maintain a constant pH
- C) To minimize the decomposition of diazonium salts
- D) To enhance color development
Correct Answer: C) To minimize the decomposition of diazonium salts
In diazotization titration, what is the role of the standard solution of sodium nitrite (NaNO2)?
- A) To serve as the titrant
- B) To act as the pH indicator
- C) To promote the formation of a colored complex
- D) To neutralize the solution
Correct Answer: A) To serve as the titrant
Which of the following is a common primary aromatic amine that can be quantified using diazotization titration?
- A) Ethanol
- B) Aniline
- C) Acetic acid
- D) Sodium hydroxide
Correct Answer: B) Aniline
What is the purpose of adding a pH indicator in diazotization titration?
- A) To enhance color development
- B) To maintain a constant pH
- C) To neutralize the solution
- D) To promote the formation of diazonium salts
Correct Answer: B) To maintain a constant pH
In diazotization titration, what is the expected color change when the endpoint is reached using a pH indicator?
- A) From red to yellow
- B) From colorless to pink
- C) From yellow to blue
- D) From green to red
Correct Answer: B) From colorless to pink
What type of compounds is often present as interfering substances in diazotization titration, leading to the need for masking or separation techniques?
- A) Organic acids
- B) Alkali metals
- C) Sulfates
- D) Other primary amines
Correct Answer: D) Other primary amines
Which of the following is a critical precaution when handling diazonium salts in diazotization titration?
- A) Avoid contact with sodium nitrite
- B) Store the solution in clear glass containers
- C) Work in a brightly lit laboratory
- D) Use plastic or rubber gloves
Correct Answer: D) Use plastic or rubber gloves
What is the primary analytical objective of diazotization titration?
- A) To determine the concentration of anions
- B) To quantify primary aliphatic amines
- C) To estimate the pH of a solution
- D) To measure the concentration of primary aromatic amines
Correct Answer: D) To measure the concentration of primary aromatic amines
Which of the following is a common application of diazotization titration in various industries?
- A) Determination of acidity in fruit juices
- B) Estimation of chloride ions in water samples
- C) Quantification of primary aromatic amines in dyes
- D) Analysis of heavy metals in soil samples
Correct Answer: C) Quantification of primary aromatic amines in dyes
In diazotization titration, what role does the buffer solution play?
- A) To enhance color development
- B) To maintain a constant pH
- C) To neutralize the solution
- D) To promote the formation of diazonium salts
Correct Answer: B) To maintain a constant pH
Which of the following is a crucial safety measure when working with diazonium salts in diazotization titration?
- A) Store solutions in open containers
- B) Dispose of waste solutions down the sink
- C) Avoid inhaling fumes
- D) Use metal utensils for handling
Correct Answer: C) Avoid inhaling fumes
What is the primary purpose of using a standard solution of sodium nitrite (NaNO2) in diazotization titration?
- A) To neutralize the solution
- B) To promote the formation of colored complexes
- C) To serve as the titrant
- D) To minimize decomposition of diazonium salts
Correct Answer: C) To serve as the titrant
In diazotization titration, what happens if the pH of the solution becomes too acidic?
- A) The reaction rate increases
- B) The solution turns yellow
- C) Decomposition of diazonium salts occurs
- D) The endpoint becomes difficult to detect
Correct Answer: C) Decomposition of diazonium salts occurs
Which of the following statements about diazotization titration is true?
- A) It is primarily used to quantify secondary amines.
- B) It involves the conversion of secondary aliphatic amines to diazonium salts.
- C) It is sensitive to changes in temperature.
- D) It uses potassium nitrate as the standard titrant.
Correct Answer: C) It is sensitive to changes in temperature.
What is the primary objective of adding a pH indicator during diazotization titration?
- A) To enhance color development
- B) To maintain a constant pH
- C) To neutralize the solution
- D) To promote the formation of diazonium salts
Correct Answer: B) To maintain a constant pH
In diazotization titration, what can be done to minimize the influence of interfering substances?
- A) Increase the concentration of the sample
- B) Use a stronger pH indicator
- C) Employ masking or separation techniques
- D) Decrease the temperature of the solution
Correct Answer: C) Employ masking or separation techniques
In which type of industry is diazotization titration commonly applied for quality control?
- A) Aerospace
- B) Pharmaceutical
- C) Mining
- D) Agriculture
Correct Answer: B) Pharmaceutical
What is the primary chemical reaction that occurs during diazotization titration?
- A) Esterification
- B) Halogenation
- C) Diazotization
- D) Hydrolysis
Correct Answer: C) Diazotization
Which of the following substances is commonly used as a diazotization titration indicator for the determination of amines?
- A) Bromothymol blue
- B) Bromine water
- C) Naphthol
- D) Sodium hydroxide (NaOH)
Correct Answer: C) Naphthol
In diazotization titration, what is the purpose of adding sodium nitrite (NaNO2) to the solution?
- A) To neutralize acidic solutions
- B) To accelerate the reaction rate
- C) To convert primary aromatic amines to diazonium salts
- D) To increase the pH of the solution
Correct Answer: C) To convert primary aromatic amines to diazonium salts
When performing diazotization titration, why is temperature control crucial?
- A) To prevent the formation of precipitates
- B) To minimize the influence of interfering substances
- C) To ensure the safety of the operator
- D) To control the rate of diazotization reactions
Correct Answer: D) To control the rate of diazotization reactions
In diazotization titration, what is the primary function of the buffer solution?
- A) To enhance color development
- B) To neutralize acidic solutions
- C) To maintain a constant pH
- D) To promote the formation of colored complexes
Correct Answer: C) To maintain a constant pH
Which of the following primary aromatic amines is commonly analyzed using diazotization titration in the textile industry?
- A) Phenol
- B) Aniline
- C) Toluene
- D) Ethanol
Correct Answer: B) Aniline
What is the role of a pH indicator in diazotization titration?
- A) To enhance color development
- B) To promote the formation of diazonium salts
- C) To maintain a constant pH
- D) To neutralize acidic solutions
Correct Answer: A) To enhance color development
Which safety precaution should be followed when handling diazotization titration solutions?
- A) Use glass containers for all solutions.
- B) Work in a well-ventilated area.
- C) Dispose of waste solutions in regular trash bins.
- D) Avoid using gloves to handle solutions.
Correct Answer: B) Work in a well-ventilated area.
In diazotization titration, what is the primary method for minimizing the influence of interfering substances?
- A) Increasing the concentration of the sample
- B) Using a stronger pH indicator
- C) Employing masking or separation techniques
- D) Lowering the temperature of the solution
Correct Answer: C) Employing masking or separation techniques
Which of the following is a typical endpoint color change observed in diazotization titration?
- A) From colorless to yellow
- B) From red to green
- C) From blue to purple
- D) From pink to colorless
Correct Answer: D) From pink to colorless
What is the primary analytical goal of diazotization titration?
- A) To determine the concentration of anions
- B) To measure the concentration of primary aliphatic amines
- C) To estimate the pH of a solution
- D) To quantify primary aromatic amines
Correct Answer: D) To quantify primary aromatic amines
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