Gravimetric Analysis MCQs

Gravimetric Analysis – MCQs

Gravimetric analysis is a precise quantitative technique in analytical chemistry used to determine the amount of an analyte by converting it into a stable, weighable form. This method ensures high accuracy and is widely applied in inorganic analysis. Explore essential MCQs on gravimetric analysis to enhance your understanding and test your knowledge.

Precipitation in Gravimetric Analysis

1. Gravimetric analysis is based on the measurement of:
   (a) Volume
   (b) Mass
   (c) Electrical conductivity
   (d) Optical density
   Show Answer Answer: (b) Mass

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2. In precipitation gravimetry, the precipitate should ideally be:
   (a) Highly soluble
   (b) Finely divided and difficult to filter
   (c) Crystalline and easily filterable
   (d) Hygroscopic and unstable
   Show Answer Answer: (c) Crystalline and easily filterable

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3. The most commonly used precipitating reagent in chloride determination is:
   (a) Barium chloride
   (b) Silver nitrate
   (c) Lead acetate
   (d) Sodium sulfate
   Show Answer Answer: (b) Silver nitrate

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4. In gravimetric analysis, which condition favors the formation of pure precipitate?
   (a) Rapid precipitation
   (b) High temperature and slow precipitation
   (c) Using excess reagent
   (d) Low pH
   Show Answer Answer: (b) High temperature and slow precipitation

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Filtration in Gravimetric Analysis

5. Which type of filter paper is commonly used for collecting fine precipitates?
   (a) Whatman No. 1
   (b) Whatman No. 42
   (c) Whatman No. 4
   (d) Whatman No. 50
   Show Answer Answer: (b) Whatman No. 42

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6. Which type of filtration is preferred in gravimetric analysis?
   (a) Cold filtration
   (b) Hot filtration
   (c) Vacuum filtration
   (d) Centrifugation
   Show Answer Answer: (c) Vacuum filtration

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7. The role of filtration in gravimetric analysis is to:
   (a) Remove excess reagent
   (b) Separate the precipitate from the solution
   (c) Increase solubility of the precipitate
   (d) Reduce contamination
   Show Answer Answer: (b) Separate the precipitate from the solution

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Drying & Ignition in Gravimetric Analysis

8. Why is drying necessary before weighing the precipitate?
   (a) To remove moisture
   (b) To increase the mass
   (c) To dissolve impurities
   (d) To increase solubility
   Show Answer Answer: (a) To remove moisture

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9. Which equipment is commonly used for ignition in gravimetric analysis?
   (a) Oven
   (b) Desiccator
   (c) Muffle furnace
   (d) Bunsen burner
   Show Answer Answer: (c) Muffle furnace

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10. What is the function of a desiccator in gravimetric analysis?
    (a) To remove gases
    (b) To cool and store dried precipitates in a moisture-free environment
    (c) To ignite organic samples
    (d) To reduce particle size
    Show Answer Answer: (b) To cool and store dried precipitates in a moisture-free environment

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11. Ignition in gravimetric analysis is performed to:
    (a) Remove volatile substances
    (b) Dissolve the precipitate
    (c) Increase solubility of precipitate
    (d) Prevent contamination
    Show Answer Answer: (a) Remove volatile substances

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