Gravimetric Analysis Complete

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.

Basic Level (1-5)

1. What is Gravimetric Analysis?
   (a) A technique based on mass measurement
   (b) A technique based on volume measurement
   (c) A technique based on pH measurement
   (d) A technique based on temperature measurement
   Show Answer Answer: (a) A technique based on mass measurement

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2. In gravimetric analysis, which step is performed first?
   (a) Drying
   (b) Precipitation
   (c) Filtration
   (d) Weighing
   Show Answer Answer: (b) Precipitation

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3. A precipitate should be __________ for an accurate gravimetric analysis.
   (a) Soluble
   (b) Insoluble
   (c) Highly reactive
   (d) Easily decomposable
   Show Answer Answer: (b) Insoluble

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4. What is the ideal property of a precipitate for filtration?
   (a) Large particle size
   (b) High solubility
   (c) Low density
   (d) Small surface area
   Show Answer Answer: (a) Large particle size

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5. Why is a precipitate washed after filtration?
   (a) To remove impurities
   (b) To increase solubility
   (c) To change the pH
   (d) To dissolve the precipitate
   Show Answer Answer: (a) To remove impurities

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Intermediate Level (1-3)

1. What is the main disadvantage of a colloidal precipitate?
   (a) It has a large particle size
   (b) It is easily filterable
   (c) It remains suspended in the solution
   (d) It contains no impurities
   Show Answer Answer: (c) It remains suspended in the solution

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2. What is co-precipitation?
   (a) Loss of analyte during precipitation
   (b) Precipitation of impurities along with the desired compound
   (c) Removal of moisture from a sample
   (d) Conversion of a compound into a gas
   Show Answer Answer: (b) Precipitation of impurities along with the desired compound

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3. Which filtration technique is preferred for colloidal precipitates?
   (a) Vacuum filtration
   (b) Gravity filtration
   (c) Hot filtration
   (d) Centrifugation
   Show Answer Answer: (a) Vacuum filtration

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Advanced Level (1-3)

1. What is the role of a desiccator in gravimetric analysis?
   (a) To accelerate precipitation
   (b) To prevent contamination during drying
   (c) To remove volatile compounds
   (d) To convert the precipitate into another form
   Show Answer Answer: (b) To prevent contamination during drying

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2. How does pH affect precipitation?
   (a) It has no effect
   (b) It alters the solubility of the precipitate
   (c) It increases the speed of drying
   (d) It makes filtration easier
   Show Answer Answer: (b) It alters the solubility of the precipitate

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3. Which of the following is an example of volatilization gravimetry?
   (a) Determining sulfate using barium chloride
   (b) Determining calcium by precipitating calcium oxalate
   (c) Determining water content by heating
   (d) Determining silver by precipitating silver chloride
   Show Answer Answer: (c) Determining water content by heating

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