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
Gravimetric analysis is based on the measurement of:
(a) Volume
(b) Mass
(c) Electrical conductivity
(d) Optical density
Answer: (b) Mass
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
Answer: (c) Crystalline and easily filterable
The most commonly used precipitating reagent in chloride determination is:
(a) Barium chloride
(b) Silver nitrate
(c) Lead acetate
(d) Sodium sulfate
Answer: (b) Silver nitrate
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
Answer: (b) High temperature and slow precipitation
Filtration in Gravimetric Analysis
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
Answer: (b) Whatman No. 42
Which type of filtration is preferred in gravimetric analysis?
(a) Cold filtration
(b) Hot filtration
(c) Vacuum filtration
(d) Centrifugation
Answer: (c) Vacuum filtration
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
Answer: (b) Separate the precipitate from the solution
Drying & Ignition in Gravimetric Analysis
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
Answer: (a) To remove moisture
Which equipment is commonly used for ignition in gravimetric analysis?
(a) Oven
(b) Desiccator
(c) Muffle furnace
(d) Bunsen burner
Answer: (c) Muffle furnace
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
Answer: (b) To cool and store dried precipitates in a moisture-free environment
Ignition in gravimetric analysis is performed to:
(a) Remove volatile substances
(b) Dissolve the precipitate
(c) Increase solubility of precipitate
(d) Prevent contamination
Answer: (a) Remove volatile substances
