Fill in the following blanks with suitable words :
Some susbtances can be obtained in pure state from their solutions by __________.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for a suitable word to fill in the blank regarding how some substances can be obtained in a pure state from their solutions.

2. **Identifying the Process**: The process that allows us to obtain pure substances from their solutions is known in chemistry.

3. **Recalling the Correct Term**: The term that describes this process is "crystallization." Crystallization is a method used to separate a solid (solute) from a solution, allowing the solid to form crystals, which are pure substances.

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