Question

Name a technique used to separate: Sodium chloride and sugar
A) Filtration and evaporation
B) Filtration and distillation
C) Filtration and sublimation
D) None of these

Answer 1

Hint: Sugar is an organic compound which contains carbon so it will be soluble in organic solvents. Sodium chloride is a neutral molecule which is not soluble in organic solvents.

Complete step by step answer:
Sodium chloride is commonly known as salt and it has chemical formula NaCl.
Sugar is an organic compound with chemical formula ${{\text{C}}_{12}}{{\text{H}}_{22}}{{\text{O}}_{11}}$ .Sugar is soluble in alcohol but salt is not soluble in alcohol. So to separate the mixtures we can follow the following steps-
1. Add ethanol or any other alcohol in the mixture.
2. Since salt is not soluble in it so it can be separated by using a filter. So filter out the salt. This step is called filtration.
3. Now only the mixture of alcohol and sugar remains. Evaporate the alcohol so only sugar will be left. This step is called evaporation.
So the correct answer is filtration and evaporation.

Hence the correct option is ‘A’.

Additional Information:
Distillation is the process in which components of mixture are separated due to variation in boiling points. It is also used to purify a compound by separating the non-volatile substance. Example- many products are obtained from distillation of Petroleum.
Sublimation is the process in which a substance in solid state is directly converted into gaseous state without the transition into liquid state. This method is used to purify volatile solids. Example-Purification of naphthalene.

Note:
Filtration and evaporation are also used in our daily life around us like-
1. Evaporation- in drying clothes in sun drying of hair, melting of ice cube and removal of nail paint by evaporation of acetone.
2.Filtration- In the heating, ventilation and air conditioning system, our nose which daily filters air, in vacuum cleaners.