Question

The crystallization is a better method than evaporation for separation of the mixture.
A.) True
B.) False

Answer 1

Hint: Try to recall that crystallization is the solidification of atoms/molecules into a structured form called a crystal and evaporation is the process by which water vapour changes from a liquid to a gas or vapour. Now, by using this you can easily answer the given question.

Complete step by step solution:
It is known to you that crystallization is the process of cooling a hot, concentrated solution of a substance obtained from crystals.
The process of crystallization is used for obtaining a pure solid substance from impure samples.
Crystallization is based on the principles of solubility: compounds (solutes) tend to be more soluble than in hot liquids (solvent) and form crystals of pure compounds.
Also, it is known that evaporation is the process of liquid changing into vapour state. It is an endothermic process i.e. heat is absorbed during evaporation.
Evaporation takes place only at the surface whereas crystallization takes place throughout the container.
It is known that crystallization is better technique than evaporation for the separation of mixture because of the following reasons:
Some solids like sugar decompose or get charred on heating to dryness during evaporation. There is such a problem in crystallization.
Also, it has been seen that during evaporation, soluble impurities do not get removed whereas in the crystallization process, such impurities get removed.
Therefore, from above we can say that the given statement is true or option A is the correct option to the given question.

Note: It should be remembered to you that the rate of evaporation increases with an increase in temperature, surface area and wind speed but it decreases with an increase in humidity.
Also, you should remember that crystallization is based on the solubility of solute in liquid (solvent).