GK
GENERAL SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Gravity separation
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Sublimation
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Dry distillation
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Dissolving water
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Detailed explanation-1: -You can separate a mixture of sand, salt and water by decantation and evaporation. Decantation will separate sand from salt and water. Sand remains in the original vessel, whereas salt and water is transfered to new vessel. Evaporation will separate salt from water.
Detailed explanation-2: -So, the mixture of salt and sand cannot be separated by picking. Note: The mixture of salt and sand can also be separated by melting point, salt (sodium chloride, NaCl), and sand (silicon dioxide, SiO2) have different melting points.
Detailed explanation-3: -Water cannot be used to separate a mixture of sugar and salt as both sugar and salt show very good solubility in water. However, salt being an ionic compound would not be soluble in alcohol ( like dissolves like). On the other hand, sugar is very much soluble in alcohol.