We have provided 60 MCQs on Complexometric titration, Unit-3, 1st semester, Pharmaceutical Analysis, B. Pharm.
We have covered following topics.
Complexometric titration: Classification, metal ion indicators, masking and demasking reagents, estimation of Magnesium sulphate, and calcium gluconate.
Table of Contents
MCQ on Complexometric Titration
What is the primary purpose of complexometric titrations?
- A) To determine the concentration of a titrant
- B) To estimate the pH of a solution
- C) To analyze metal ions using chelating agents
- D) To measure the electrical conductivity of a solution
Correct Answer: C) To analyze metal ions using chelating agents
Which of the following statements about complexometric titrations is true?
- A) They are limited to the analysis of non-metallic ions.
- B) They involve the use of acids as titrants.
- C) They rely on the formation of complexes with metal ions.
- D) They are exclusively used for pH determination.
Correct Answer: C) They rely on the formation of complexes with metal ions.
What are metal ion indicators commonly used for in complexometric titrations?
- A) To change the color of the solution at the endpoint
- B) To determine the concentration of metal ions
- C) To enhance the precision of the titration
- D) To mask interfering ions
Correct Answer: A) To change the color of the solution at the endpoint
Which of the following indicators is commonly used in complexometric titrations to detect the endpoint of the titration with metal ions?
- A) Phenolphthalein
- B) Starch solution
- C) Eriochrome Black T
- D) Bromothymol Blue
Correct Answer: C) Eriochrome Black T
In complexometric titrations, what is the purpose of masking agents?
- A) To accelerate the reaction between metal ions and chelating agents
- B) To enhance the color change of the indicator
- C) To reduce interference from unwanted metal ions
- D) To neutralize the effects of pH changes
Correct Answer: C) To reduce interference from unwanted metal ions
Which of the following is an example of a common masking agent used in complexometric titrations?
- A) Hydrochloric acid (HCl)
- B) Ammonium chloride (NH4Cl)
- C) Sodium hydroxide (NaOH)
- D) Ethylenediaminetetraacetic acid (EDTA)
Correct Answer: B) Ammonium chloride (NH4Cl)
In complexometric titrations, what is the primary purpose of demasking reagents?
- A) To release masked metal ions for analysis
- B) To increase the stability of metal ion complexes
- C) To create complexometric indicators
- D) To adjust the pH of the solution
Correct Answer: A) To release masked metal ions for analysis
What is the chemical formula of ethylenediaminetetraacetic acid (EDTA), a commonly used chelating agent in complexometric titrations?
- A) C6H12O6
- B) C2H4O2
- C) C10H16N2O8
- D) C3H8O3
Correct Answer: C) C10H16N2O8
In the estimation of magnesium sulfate (MgSO4) using complexometric titration, which chelating agent is typically used?
- A) Sodium hydroxide (NaOH)
- B) Eriochrome Black T
- C) Sodium carbonate (Na2CO3)
- D) Ethylenediaminetetraacetic acid (EDTA)
Correct Answer: D) Ethylenediaminetetraacetic acid (EDTA)
What is the main function of Eriochrome Black T in complexometric titrations?
- A) To mask interfering ions
- B) To enhance the color change at the endpoint
- C) To release metal ions from masking agents
- D) To stabilize metal ion complexes
Correct Answer: B) To enhance the color change at the endpoint
Complexometric titration is commonly used for the estimation of which metal ion in calcium gluconate?
- A) Calcium (Ca²⁺)
- B) Sodium (Na⁺)
- C) Magnesium (Mg²⁺)
- D) Potassium (K⁺)
Correct Answer: A) Calcium (Ca²⁺)
What is the primary purpose of adding a complexing agent like EDTA in the estimation of calcium gluconate?
- A) To mask the calcium ions
- B) To release calcium ions from masking agents
- C) To change the color of the solution
- D) To enhance the precision of the titration
Correct Answer: B) To release calcium ions from masking agents
Which of the following is a common indicator used in complexometric titrations for the estimation of calcium ions (Ca²⁺)?
- A) Phenolphthalein
- B) Eriochrome Black T
- C) Starch solution
- D) Bromothymol Blue
Correct Answer: A) Phenolphthalein
In complexometric titrations, what is the primary role of masking agents when dealing with a mixture of metal ions?
- A) To enhance the color change at the endpoint
- B) To prevent the formation of complexes
- C) To selectively mask and stabilize certain metal ions
- D) To increase the pH of the solution
Correct Answer: C) To selectively mask and stabilize certain metal ions
What is the color change of the indicator during the endpoint in a complexometric titration for calcium ions using Eriochrome Black T?
- A) From red to colorless
- B) From yellow to blue
- C) From blue to yellow
- D) From colorless to red
Correct Answer: B) From yellow to blue
Which of the following substances is typically used as a masking agent for calcium ions (Ca²⁺) in complexometric titrations?
- A) Ammonium chloride (NH4Cl)
- B) Sodium carbonate (Na2CO3)
- C) Hydrochloric acid (HCl)
- D) Ethylenediaminetetraacetic acid (EDTA)
Correct Answer: B) Sodium carbonate (Na2CO3)
In the complexometric titration of calcium ions using EDTA, what is the role of the metal ion indicator Eriochrome Black T?
- A) To create a colorless complex with calcium ions
- B) To change color from blue to pink at the endpoint
- C) To mask calcium ions from interfering metal ions
- D) To release calcium ions from masking agents
Correct Answer: B) To change color from blue to pink at the endpoint
Which of the following metal ions can be estimated using complexometric titrations with EDTA as a chelating agent?
- A) Copper (Cu²⁺)
- B) Iron (Fe²⁺)
- C) Magnesium (Mg²⁺)
- D) Sodium (Na⁺)
Correct Answer: B) Iron (Fe²⁺)
What is the primary purpose of a demasking reagent in complexometric titrations?
- A) To release chelated metal ions for analysis
- B) To enhance the color change of the indicator
- C) To create a stable complex with metal ions
- D) To increase the pH of the solution
Correct Answer: A) To release chelated metal ions for analysis
In the estimation of magnesium sulfate using complexometric titration with EDTA, which substance forms a stable complex with magnesium ions (Mg²⁺)?
- A) Sodium hydroxide (NaOH)
- B) Ammonium chloride (NH4Cl)
- C) Eriochrome Black T
- D) Ethylenediaminetetraacetic acid (EDTA)
Correct Answer: D) Ethylenediaminetetraacetic acid (EDTA)
What is the main role of a metal ion indicator in complexometric titrations?
- A) To mask metal ions
- B) To enhance the color change at the endpoint
- C) To create a stable complex with metal ions
- D) To increase the pH of the solution
Correct Answer: B) To enhance the color change at the endpoint
In complexometric titrations, what is the purpose of a masking agent for a particular metal ion?
- A) To increase the solubility of the metal complex
- B) To form a colored complex with the metal ion
- C) To enhance the precision of the titration
- D) To selectively bind and protect the metal ion from titration
Correct Answer: D) To selectively bind and protect the metal ion from titration
Which metal ion indicator is commonly used in the complexometric titration of calcium ions (Ca²⁺)?
- A) Methyl orange
- B) Bromothymol Blue
- C) Eriochrome Black T
- D) Phenolphthalein
Correct Answer: D) Phenolphthalein
In the complexometric titration of calcium ions with EDTA, what is the color change of the indicator at the endpoint?
- A) From pink to colorless
- B) From red to yellow
- C) From yellow to blue
- D) From blue to red
Correct Answer: A) From pink to colorless
What is the role of a masking agent in complexometric titrations?
- A) To indicate the endpoint of the titration
- B) To form a stable complex with the metal ion
- C) To increase the pH of the solution
- D) To enhance the color change of the indicator
Correct Answer: B) To form a stable complex with the metal ion
In the estimation of magnesium sulfate using complexometric titration, which chelating agent forms a complex with magnesium ions (Mg²⁺)?
- A) Eriochrome Black T
- B) Sodium carbonate (Na2CO3)
- C) Ethylenediaminetetraacetic acid (EDTA)
- D) Sodium hydroxide (NaOH)
Correct Answer: C) Ethylenediaminetetraacetic acid (EDTA)
What happens to the color of the indicator Eriochrome Black T during the endpoint in the complexometric titration of calcium ions?
- A) It changes from pink to blue.
- B) It turns from yellow to red.
- C) It remains colorless.
- D) It shifts from green to violet.
Correct Answer: A) It changes from pink to blue.
In complexometric titrations, what is the primary purpose of a demasking reagent?
- A) To create a colored complex with the metal ion
- B) To mask the metal ions
- C) To enhance the stability of metal complexes
- D) To release the metal ions from masking agents
Correct Answer: D) To release the metal ions from masking agents
Which of the following metal ions can be estimated using complexometric titration with EDTA as the chelating agent?
- A) Sodium (Na⁺)
- B) Potassium (K⁺)
- C) Copper (Cu²⁺)
- D) Zinc (Zn²⁺)
Correct Answer: D) Zinc (Zn²⁺)
In the estimation of calcium gluconate using complexometric titration, which specific component is targeted for titration?
- A) Calcium ions (Ca²⁺)
- B) Gluconate ions (C6H11O7⁻)
- C) Sodium ions (Na⁺)
- D) Magnesium ions (Mg²⁺)
Correct Answer: A) Calcium ions (Ca²⁺)
In complexometric titrations, what is the primary function of a metal ion indicator?
- A) To mask the metal ions
- B) To form a complex with the metal ions
- C) To indicate the endpoint of the titration
- D) To increase the pH of the solution
Correct Answer: C) To indicate the endpoint of the titration
Which metal ion indicator is commonly used in the complexometric titration of calcium ions (Ca²⁺) when titrated with ethylenediaminetetraacetic acid (EDTA)?
- A) Phenolphthalein
- B) Methyl orange
- C) Eriochrome Black T
- D) Bromothymol Blue
Correct Answer: C) Eriochrome Black T
In the complexometric titration of calcium ions using Eriochrome Black T, what color change is observed at the endpoint?
- A) From blue to colorless
- B) From red to yellow
- C) From yellow to blue
- D) From pink to colorless
Correct Answer: C) From yellow to blue
Which of the following substances is typically used as a masking agent for calcium ions (Ca²⁺) in complexometric titrations?
- A) Ammonium chloride (NH4Cl)
- B) Sodium carbonate (Na2CO3)
- C) Sodium hydroxide (NaOH)
- D) Ethylenediaminetetraacetic acid (EDTA)
Correct Answer: B) Sodium carbonate (Na2CO3)
In complexometric titrations, what is the primary role of demasking reagents?
- A) To create a colored complex with the metal ions
- B) To mask the metal ions
- C) To enhance the stability of metal complexes
- D) To release the metal ions from masking agents
Correct Answer: D) To release the metal ions from masking agents
What happens to the color of the indicator Eriochrome Black T during the endpoint in the complexometric titration of calcium ions?
- A) It changes from pink to blue.
- B) It turns from yellow to red.
- C) It remains colorless.
- D) It shifts from green to violet.
Correct Answer: A) It changes from pink to blue.
In the estimation of magnesium sulfate using complexometric titration, which chelating agent forms a complex with magnesium ions (Mg²⁺)?
- A) Eriochrome Black T
- B) Sodium carbonate (Na2CO3)
- C) Ethylenediaminetetraacetic acid (EDTA)
- D) Sodium hydroxide (NaOH)
Correct Answer: C) Ethylenediaminetetraacetic acid (EDTA)
Which of the following metal ions can be estimated using complexometric titration with EDTA as the chelating agent?
- A) Sodium (Na⁺)
- B) Potassium (K⁺)
- C) Copper (Cu²⁺)
- D) Zinc (Zn²⁺)
Correct Answer: D) Zinc (Zn²⁺)
In the estimation of calcium gluconate using complexometric titration, which specific component is targeted for titration?
- A) Calcium ions (Ca²⁺)
- B) Gluconate ions (C6H11O7⁻)
- C) Sodium ions (Na⁺)
- D) Magnesium ions (Mg²⁺)
Correct Answer: A) Calcium ions (Ca²⁺)
What is the main purpose of a complexing agent like EDTA in complexometric titrations?
- A) To mask the metal ions
- B) To enhance the color change at the endpoint
- C) To create a stable complex with metal ions
- D) To increase the pH of the solution
Correct Answer: C) To create a stable complex with metal ions
In the complexometric titration of calcium ions (Ca²⁺) using EDTA, what is the purpose of adding a buffer solution?
- A) To increase the pH of the solution
- B) To enhance the color change of the indicator
- C) To maintain a constant pH and prevent interference
- D) To precipitate calcium ions as calcium carbonate
Correct Answer: C) To maintain a constant pH and prevent interference
Which of the following is a common masking agent used for calcium ions (Ca²⁺) in complexometric titrations?
- A) Ammonium hydroxide (NH4OH)
- B) Sodium carbonate (Na2CO3)
- C) Potassium dichromate (K2Cr2O7)
- D) Sodium hydroxide (NaOH)
Correct Answer: B) Sodium carbonate (Na2CO3)
In complexometric titrations, what is the primary role of a demasking reagent?
- A) To create a colored complex with metal ions
- B) To mask the metal ions
- C) To enhance the stability of metal complexes
- D) To release the metal ions from masking agents
Correct Answer: D) To release the metal ions from masking agents
Which metal ion indicator is often used in the complexometric titration of magnesium ions (Mg²⁺)?
- A) Bromothymol Blue
- B) Eriochrome Black T
- C) Phenolphthalein
- D) Methyl orange
Correct Answer: A) Bromothymol Blue
What happens to the color of Bromothymol Blue during the endpoint in the complexometric titration of magnesium ions (Mg²⁺)?
- A) It changes from blue to yellow.
- B) It turns from yellow to blue.
- C) It remains green.
- D) It shifts from red to colorless.
Correct Answer: A) It changes from blue to yellow.
In complexometric titrations, what is the primary function of a metal ion indicator like Eriochrome Black T?
- A) To mask metal ions
- B) To form a colored complex with metal ions
- C) To indicate the endpoint of the titration
- D) To increase the pH of the solution
Correct Answer: C) To indicate the endpoint of the titration
Which of the following substances is typically used as a masking agent for magnesium ions (Mg²⁺) in complexometric titrations?
- A) Ammonium chloride (NH4Cl)
- B) Sodium carbonate (Na2CO3)
- C) Ethylenediaminetetraacetic acid (EDTA)
- D) Sodium hydroxide (NaOH)
Correct Answer: A) Ammonium chloride (NH4Cl)
In the estimation of calcium ions (Ca²⁺) in calcium gluconate using complexometric titration, what is the primary purpose of adding EDTA?
- A) To mask the calcium ions
- B) To release the calcium ions from masking agents
- C) To create a color change at the endpoint
- D) To increase the pH of the solution
Correct Answer: B) To release the calcium ions from masking agents
Which metal ion is commonly estimated using complexometric titrations with the help of a chelating agent like EDTA in the analysis of water hardness?
- A) Iron (Fe²⁺)
- B) Calcium (Ca²⁺)
- C) Magnesium (Mg²⁺)
- D) Sodium (Na⁺)
Correct Answer: C) Magnesium (Mg²⁺)
What is the primary advantage of using complexometric titrations for metal ion analysis in comparison to other titration methods?
- A) They require a lower pH for titration.
- B) They involve the formation of a gas as the endpoint.
- C) They offer high specificity for particular metal ions.
- D) They use strong acids as titrants.
Correct Answer: C) They offer high specificity for particular metal ions.
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