Gravimetric Analysis – Precipitation, Filtration, and Drying MCQs

Gravimetric Analysis – Precipitation, Filtration, and Drying MCQs

Gravimetric analysis is a precise quantitative method used to determine the amount of an analyte based on its mass. It involves precipitation, where the analyte forms an insoluble compound, filtration, to separate the precipitate, and drying, to obtain a constant weight for accurate measurement. Explore our Gravimetric Analysis MCQs to test your knowledge of these essential steps.

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. Which condition favors the formation of pure precipitate in gravimetric analysis?
   (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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3. What is the main requirement for a precipitate in gravimetric analysis?
   (a) It should be highly soluble
   (b) It should be easily filterable and stable
   (c) It should absorb light
   (d) It should have a high vapor pressure
   Show Answer Answer: (b) It should be easily filterable and stable

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4. The most common 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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Filtration in Gravimetric Analysis

1. Filtration in gravimetric analysis is done to:
   (a) Remove excess reagent
   (b) Separate precipitate from the solution
   (c) Increase solubility of precipitate
   (d) Prevent contamination
   Show Answer Answer: (b) Separate precipitate from the solution

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2. Which 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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3. 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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4. The role of a filter crucible in gravimetric analysis is:
   (a) To store solutions
   (b) To filter and collect precipitates
   (c) To measure weight directly
   (d) To dissolve impurities
   Show Answer Answer: (b) To filter and collect precipitates

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Drying in Gravimetric Analysis

1. 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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2. 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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3. 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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