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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• Unit-2
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