Multiple choice

A mixture of salt and sand can be separated by

  1. sublimation

  2. dissolving water

  3. gravity separation

  4. dry distillation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Salt (NaCl) is water-soluble while sand (SiO2) is not. Adding water dissolves the salt, leaving sand as insoluble residue. The salt can then be recovered by evaporating the water. The option wording 'dissolving water' is awkward but the intended meaning is correct.

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