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A pure crystalline material, when heated slowly, first changes into a cloudy liquid at a fixed temperature, and on further heating the cloudiness vanishes completely. This is a typical property of substances that form

1. allotropic crystals
2. liquid crystals
3. isomeric crystals
4. isomorphous crystals

Correct answer: liquid crystals

Solution

Liquid crystals exhibit a unique phase transition where they first become cloudy as they melt, indicating a mix of solid and liquid phases, and then clear up as they fully transition to the liquid state. This behavior is characteristic of liquid crystals, distinguishing them from other types of crystalline materials.

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