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The pure crystalline substance on being heated gradually first forms a turbid liquid at constant temperature and still at higher temperature turbidity completely disappears. The behaviour is a characteristic of substance forming

1. Allotropic crystals
2. Liquid crystals
3. Isomeric crystals
4. Isomorphous crystals

Correct answer: Liquid crystals

Solution

The described behavior, where a crystalline substance transitions to a turbid liquid and then to a clear liquid upon heating, is characteristic of liquid crystals. These substances exhibit properties of both liquids and solids in specific temperature ranges.

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