Which of the following mixtures would be best separated by filtration?
A) A solution of salt in water
B) An alloy of zinc and iron
C) A mixture of carbon dioxide and oxygen
D) A mixture of water and alcohol
E) A mixture of sand and gravel

Question

Quizplus · Accepted Answer

Sand and gravel can be separated by filtration because one is solid and the other is not, allowing the solid to be trapped by the filter while the fluid passes through. The other options are not suitable for filtration: Salt in water would require evaporation, zinc and iron would require a chemical separation process, carbon dioxide and oxygen would require a physical property difference such as distillation, and water and alcohol would require a separation by distillation or a chemical process.

Which of the Following Mixtures Would Be Best Separated by Filtration