We have provided 60 MCQs on Gravimetry Unit-3, 1st semester, Pharmaceutical Analysis, B. Pharm.
We have covered following topics.
Gravimetry: Principle and steps involved in gravimetric analysis. Purity of the precipitate: co-precipitation and post precipitation, Estimation of barium sulphate.
Table of Contents
MCQ on Gravimetry
- What is the fundamental principle of gravimetric analysis?
- A) Measurement of electrical conductivity
- B) Measurement of mass changes
- C) Measurement of absorbance at specific wavelengths
- D) Measurement of pH changes
Correct Answer: B) Measurement of mass changes
- In gravimetric analysis, why is it crucial to ensure that the precipitate formed is of high purity?
- A) To increase the speed of the analysis
- B) To decrease the precision of the results
- C) To minimize contamination and measurement errors
- D) To enhance the color change during titration
Correct Answer: C) To minimize contamination and measurement errors
- What is the term for the unintentional inclusion of impurities with the precipitate during gravimetric analysis?
- A) Precipitation
- B) Co-precipitation
- C) Post-precipitation
- D) Titration
Correct Answer: B) Co-precipitation
- In gravimetric analysis, what is the process of removing impurities from the precipitate after its formation?
- A) Precipitation
- B) Co-precipitation
- C) Post-precipitation
- D) Filtration
Correct Answer: C) Post-precipitation
- When estimating barium sulfate (BaSO4) in gravimetric analysis, what is the most commonly used precipitating reagent?
- A) Silver nitrate (AgNO3)
- B) Sodium chloride (NaCl)
- C) Sulfuric acid (H2SO4)
- D) Barium chloride (BaCl2)
Correct Answer: D) Barium chloride (BaCl2)
- In the gravimetric estimation of barium sulfate, what is the typical form of barium sulfate obtained as a precipitate?
- A) Gelatinous and amorphous
- B) Highly crystalline and pure
- C) Colorless and transparent
- D) Liquid and soluble
Correct Answer: B) Highly crystalline and pure
- Which step in gravimetric analysis involves the separation of the precipitate from the solution?
- A) Precipitation
- B) Co-precipitation
- C) Filtration
- D) Post-precipitation
Correct Answer: C) Filtration
- What is the primary objective of post-precipitation in gravimetric analysis?
- A) To increase the mass of the precipitate
- B) To decrease the mass of the precipitate
- C) To remove impurities from the precipitate
- D) To convert the precipitate into a soluble form
Correct Answer: C) To remove impurities from the precipitate
- Which of the following is a common source of error in gravimetric analysis due to the presence of ions that co-precipitate with the analyte?
- A) Oversaturation
- B) Co-precipitation
- C) Post-precipitation
- D) Filtration
Correct Answer: B) Co-precipitation
- What is the purpose of drying the precipitate in gravimetric analysis before measuring its mass?
- A) To remove volatile impurities
- B) To increase the solubility of the precipitate
- C) To convert the precipitate into a soluble form
- D) To enhance the color change during titration
Correct Answer: A) To remove volatile impurities
- In gravimetric analysis, which step involves the addition of a reagent to the solution to form a solid precipitate?
- A) Filtration
- B) Co-precipitation
- C) Precipitation
- D) Post-precipitation
Correct Answer: C) Precipitation
- What is the primary purpose of filtration in gravimetric analysis?
- A) To separate the precipitate from the solution
- B) To convert the precipitate into a soluble form
- C) To increase the mass of the precipitate
- D) To enhance the color change during titration
Correct Answer: A) To separate the precipitate from the solution
- During the gravimetric analysis of a compound, if the obtained precipitate is not dried thoroughly before weighing, what kind of error can occur?
- A) Systematic error
- B) Random error
- C) Co-precipitation error
- D) Oversaturation error
Correct Answer: B) Random error
- Which substance is typically used to convert the precipitate into a form suitable for weighing in gravimetric analysis?
- A) Dilute hydrochloric acid (HCl)
- B) Nitric acid (HNO3)
- C) Deionized water
- D) Sulfuric acid (H2SO4)
Correct Answer: A) Dilute hydrochloric acid (HCl)
- What is the primary role of the post-precipitation step in gravimetric analysis?
- A) To increase the mass of the precipitate
- B) To enhance the color change during titration
- C) To remove impurities from the precipitate
- D) To separate the precipitate from the solution
Correct Answer: C) To remove impurities from the precipitate
- Which factor is critical for the success of gravimetric analysis?
- A) Rapid filtration
- B) Low temperature
- C) High solubility of the precipitate
- D) Proper precipitation, filtration, and drying
Correct Answer: D) Proper precipitation, filtration, and drying
- In gravimetric analysis, what is the purpose of adding a reagent that reacts with interfering ions before precipitation?
- A) To enhance the color change at the endpoint
- B) To prevent the formation of a precipitate
- C) To mask the interfering ions
- D) To remove impurities from the precipitate
Correct Answer: C) To mask the interfering ions
- If a technician’s balance used in gravimetric analysis is not calibrated correctly, what type of error could occur?
- A) Systematic error
- B) Random error
- C) Co-precipitation error
- D) Oversaturation error
Correct Answer: A) Systematic error
- In gravimetric analysis, what role does the dilute acid play in the post-precipitation step?
- A) To dissolve the precipitate
- B) To increase the mass of the precipitate
- C) To remove volatile impurities
- D) To enhance the color change during titration
Correct Answer: C) To remove volatile impurities
- What is the key advantage of gravimetric analysis over other analytical techniques?
- A) Speed
- B) Sensitivity to color changes
- C) High precision and accuracy
- D) Minimal need for calibration
Correct Answer: C) High precision and accuracy
- In gravimetric analysis, what is the primary purpose of “digestion”?
- A) To accelerate the precipitation process
- B) To convert the precipitate into a soluble form
- C) To enhance the color change during titration
- D) To filter the solution more efficiently
Correct Answer: A) To accelerate the precipitation process
- Which of the following substances is commonly used as a filter paper in the filtration step of gravimetric analysis?
- A) Glass wool
- B) Cotton balls
- C) Cellulose nitrate
- D) Whatman filter paper
Correct Answer: D) Whatman filter paper
- In gravimetric analysis, what role does a “desiccator” play in the process?
- A) It aids in digestion of the precipitate.
- B) It filters the precipitate from the solution.
- C) It dries and protects the precipitate from moisture.
- D) It accelerates the reaction between reagents.
Correct Answer: C) It dries and protects the precipitate from moisture.
- Which of the following factors can affect the accuracy of gravimetric analysis results?
- A) The color of the precipitate
- B) The temperature of the laboratory
- C) The purity of the reagents
- D) The shape of the glassware
Correct Answer: C) The purity of the reagents
- What is the primary limitation of gravimetric analysis when compared to some other analytical methods?
- A) It requires specialized glassware.
- B) It is limited to highly soluble compounds.
- C) It is less sensitive to small quantities of analyte.
- D) It is a slow analytical technique.
Correct Answer: D) It is a slow analytical technique.
- In gravimetric analysis, which step involves heating the solution and precipitate to promote the formation of a solid phase?
- A) Precipitation
- B) Co-precipitation
- C) Digestion
- D) Filtration
Correct Answer: C) Digestion
- What is the term for the process in gravimetric analysis where the precipitate is treated with a reagent to remove impurities before filtration?
- A) Co-precipitation
- B) Post-precipitation
- C) Digestion
- D) Desiccation
Correct Answer: B) Post-precipitation
- Which of the following substances can be used as a reagent for post-precipitation in gravimetric analysis to remove interfering ions?
- A) Sodium chloride (NaCl)
- B) Ammonium hydroxide (NH4OH)
- C) Dilute hydrochloric acid (HCl)
- D) Ethylenediaminetetraacetic acid (EDTA)
Correct Answer: C) Dilute hydrochloric acid (HCl)
- In gravimetric analysis, what is the purpose of “ignition” or heating the precipitate after filtration?
- A) To remove any remaining moisture
- B) To dissolve the precipitate
- C) To accelerate the filtration process
- D) To increase the solubility of the precipitate
Correct Answer: A) To remove any remaining moisture
- What type of balance is typically used in gravimetric analysis to measure the mass of the precipitate accurately?
- A) Analytical balance
- B) Top-loading balance
- C) Spring balance
- D) Beam balance
Correct Answer: A) Analytical balance
- Which of the following steps in gravimetric analysis is essential to ensure complete separation of the precipitate from the solution?
- A) Digestion
- B) Co-precipitation
- C) Filtration
- D) Desiccation
Correct Answer: C) Filtration
- In gravimetric analysis, what is the primary function of a desiccator?
- A) To promote digestion of the precipitate
- B) To accelerate the precipitation process
- C) To remove impurities from the precipitate
- D) To dry and protect the precipitate from moisture
Correct Answer: D) To dry and protect the precipitate from moisture
- Which of the following factors can introduce a systematic error in gravimetric analysis?
- A) The shape of the glassware
- B) The operator’s skill level
- C) The purity of the reagents
- D) The calibration of the analytical balance
Correct Answer: D) The calibration of the analytical balance
- What is the primary role of digestion in gravimetric analysis?
- A) To remove impurities from the precipitate
- B) To promote the formation of a solid phase
- C) To separate the precipitate from the solution
- D) To accelerate the reaction between reagents
Correct Answer: B) To promote the formation of a solid phase
- Which term is used to describe the unintentional inclusion of impurities with the precipitate during gravimetric analysis?
- A) Precipitation
- B) Co-precipitation
- C) Post-precipitation
- D) Filtration
Correct Answer: B) Co-precipitation
- What is the primary purpose of ignition or heating the precipitate in gravimetric analysis after filtration?
- A) To increase the solubility of the precipitate
- B) To promote the formation of a solid phase
- C) To remove any remaining moisture
- D) To enhance the color change during titration
Correct Answer: C) To remove any remaining moisture
- In gravimetric analysis, what is the role of the reagent used for post-precipitation?
- A) To promote the formation of the precipitate
- B) To convert the precipitate into a soluble form
- C) To enhance the color change during titration
- D) To remove interfering ions from the precipitate
Correct Answer: D) To remove interfering ions from the precipitate
- What is the key advantage of gravimetric analysis as an analytical technique?
- A) Speed of analysis
- B) Sensitivity to color changes
- C) High precision and accuracy
- D) Minimal need for calibration
Correct Answer: C) High precision and accuracy
- Which balance is typically used in gravimetric analysis to measure the mass of the precipitate accurately?
- A) Analytical balance
- B) Top-loading balance
- C) Spring balance
- D) Beam balance
Correct Answer: A) Analytical balance
- In gravimetric analysis, what does the term “co-precipitation” refer to?
- A) The process of heating the precipitate
- B) The unintentional inclusion of impurities with the precipitate
- C) The formation of a solid phase
- D) The removal of moisture from the precipitate
Correct Answer: B) The unintentional inclusion of impurities with the precipitate
- What is the primary purpose of “digestion” in gravimetric analysis?
- A) To promote the formation of a colored complex
- B) To accelerate the reaction between reagents
- C) To enhance the color change during titration
- D) To ensure complete precipitation of the analyte
Correct Answer: D) To ensure complete precipitation of the analyte
- Which of the following is NOT a key step in gravimetric analysis?
- A) Precipitation
- B) Digestion
- C) Filtration
- D) Titration
Correct Answer: D) Titration
- In gravimetric analysis, what is the primary purpose of adding a “masking agent”?
- A) To promote digestion of the precipitate
- B) To convert the precipitate into a soluble form
- C) To prevent the formation of a precipitate
- D) To remove impurities from the precipitate
Correct Answer: D) To remove impurities from the precipitate
- What is the term for the process of removing impurities from the precipitate after its formation in gravimetric analysis?
- A) Precipitation
- B) Co-precipitation
- C) Post-precipitation
- D) Desiccation
Correct Answer: C) Post-precipitation
- Which type of error in gravimetric analysis occurs consistently in one direction and can be corrected through calibration?
- A) Systematic error
- B) Random error
- C) Co-precipitation error
- D) Oversaturation error
Correct Answer: A) Systematic error
- In gravimetric analysis, why is it important to heat the precipitate during the digestion step?
- A) To enhance the color change during titration
- B) To accelerate the filtration process
- C) To promote the formation of a solid phase
- D) To increase the mass of the precipitate
Correct Answer: C) To promote the formation of a solid phase
- What is the primary objective of “ignition” in gravimetric analysis?
- A) To increase the solubility of the precipitate
- B) To enhance the color change during titration
- C) To remove any remaining moisture from the precipitate
- D) To promote the formation of a colored complex
Correct Answer: C) To remove any remaining moisture from the precipitate
- In gravimetric analysis, which step involves the separation of the precipitate from the solution?
- A) Precipitation
- B) Digestion
- C) Filtration
- D) Co-precipitation
Correct Answer: C) Filtration
- Which of the following substances is often used as a reagent for post-precipitation in gravimetric analysis?
- A) Sodium chloride (NaCl)
- B) Dilute hydrochloric acid (HCl)
- C) Ammonium hydroxide (NH4OH)
- D) Sulfuric acid (H2SO4)
Correct Answer: B) Dilute hydrochloric acid (HCl)
- In gravimetric analysis, what is the primary role of a desiccator?
- A) To promote digestion of the precipitate
- B) To accelerate the precipitation process
- C) To dry and protect the precipitate from moisture
- D) To enhance the color change during titration
Correct Answer: C) To dry and protect the precipitate from moisture
More MCQs
Semester- 1
Human Anatomy & PhysiolPharmaceutical analysisogy
- Unit-1
- Unit-2
- Unit-3
- Unit-4
- Unit-5
