What separation technique is most suitable for recovering pure common salt from a clear salt-water solution?
Answer and explanation
Correct answer: A. Evaporation to dryness
- Step 1: Common salt dissolves completely in water to form a homogeneous solution that cannot be filtered. Step 2. Heating the solution evaporates the liquid solvent (water), leaving solid salt crystals behind. Answer: Evaporation to dryness. Why not the others: Filtration and decantation only separate insoluble solids from liquids; centrifugation separates particulate suspensions.
Practise more Living Things and Life Processes.
Free questions with an explanation for every one, and full timed Basic Education Certificate Examination mock tests.
More Living Things and Life Processes questions
- Which cellular organelle is responsible for generating aerobic chemical energy (ATP) in eukaryotic cells?
- Which of the following cellular structures is present in plant cells but strictly absent in animal cells?
- What is the primary green pigment in plant leaves that absorbs sunlight for photosynthesis?
- Which gas is released into the atmosphere as a major byproduct of the light reaction of photosynthesis?
- By which physical process do water molecules move across a selectively permeable membrane from higher to lower water potential?
- What is the basic functional filtering unit of the human kidney responsible for producing urine?