Melting Point Criterion
Easychemistry
A pure organic solid typically shows a melting point that is:
Select the correct option:
Solution
Incorrect! Answer:
Sharp (1–2°C range)
- Purity Indicator: Melting point is one of the most reliable criteria for checking the purity of a solid organic compound.
- Pure Compounds: Melt at a specific temperature. In practice, they show a sharp melting range of less than 12˘0132∘C.
- Effect of Impurities: Impurities weaken the crystal lattice.
- Mechanism: This causes the solid to begin melting at a lower temperature than the pure substance's melting point (melting point depression) and finish melting over a much broader range (e.g.,52˘01310∘C).
- Standard Utility: Comparison with literature values helps identify the substance and gauge its quality.
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About This Question
- Subject
- chemistry
- Chapter
- purification techniques
- Topic
- melting point criterion
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Sharp (1–2°C range)
- Purity Indicator: Melting point is one of the most reliable criteria for checking the purity of a solid organic compound.
- Pure Compounds: Melt at a specific temperature. In practice, they show a sharp melting range of less than 12˘0132∘C.
- Effect of Impurities: Impurities weaken the crystal lattice.
- Mechanism: This causes the solid to begin melting at a lower temperature than the pure substance's melting point (melting point depression) and finish melting over a much broader range (e.g.,52˘01310∘C).
- Standard Utility: Comparison with literature values helps identify the substance and gauge its quality.
This easy difficulty chemistry question is from the chapter purification techniques, covering the topic of melting point criterion. It appeared in the 2025 exam.
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