Question

which physical method can be used for obtaining a sample of salt from a small beaker of salt water? boiling freezing chromatography sorting

Explanation:

To obtain salt from salt water (a solution of salt and water), we can use the process of evaporation (boiling is a way to speed up evaporation). Boiling the salt water will cause the water to turn into vapor, leaving the salt behind. Freezing would turn the water into ice but not effectively separate the salt. Chromatography is used for separating mixtures based on different affinities in a medium, not for salt - water separation. Sorting is not a method for separating components of a solution. So boiling is the correct physical method.

Answer:

A. boiling