Discussion
Which of the following liquids is used to separate the soil grain on the basis of specific gravity ?
Answer: C
Soil grains are separated by specific gravity using bromoform.
Bromoform (tribromomethane) is a dense liquid, with a specific gravity of about 2.89. When soil is added to it, or to a density-gradient column made by mixing bromoform with a lighter liquid such as ethanol, light minerals such as quartz and feldspar float while heavy minerals such as magnetite and garnet sink, so the grains separate by specific gravity. Comparing these profiles helps match soil samples.
Ethanol is used only as the lighter liquid in the mixture, and sodium hydroxide solution and nitrobenzene are not heavy liquids used for this.
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