Question

A mixture of $ZnC{{l}_{2}}\text{ and PbC}{{\text{l}}_{2}}$ can be separated by:
A.Distillation
B.Crystallization
C.Sublimation
D.Adding acetic acid

Answer 1

To solve this type of question, it is important to understand the meaning of each of the processes mentioned in the options. The separation of compounds is done on the basis of their physical and chemical properties.

Complete answer:
Crystallization is the process of solidification of atoms or molecules into a structure form which is called a crystal and it is a better technique for the separation of the mixture. It is a process in which we obtained the pure crystallized form of a compound that was originally impure. The impure mixture is of$ZnC{{l}_{2}}\text{ and PbC}{{\text{l}}_{2}}$the impure substance is dissolved in a solvent in which it is sparingly soluble at room temperature and appreciably soluble at the high temperature. The solution is then heated so that all the substance is dissolved and then filtered so that the cooled crystals can be seen on the filter paper.
This process can be reversed by adding a solvent to the crystals to which the substance can dissolve completely. Thus the process of crystallization is reversible. The mixture of the compound $ZnC{{l}_{2}}\text{ and PbC}{{\text{l}}_{2}}$is a non- homogeneous mixture which means that it does not dissociate evenly into the solution.

Hence, the correct answer is option (B).

Note:
In crystallization, one does not boil the solvent. It is a natural or artificial process with which a solid is formed. The atoms and molecules are highly organized into the crystal structure, they form with precipitation, freezing or rare deposition of the gas.