Question:
The technique used to purify liquids having very high boiling points and decompose at or below their boiling point is
The technique used to purify liquids having very high boiling points and decompose at or below their boiling point is
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Vacuum distillation is used for heat-sensitive liquids with high boiling points.
Updated On: Apr 24, 2026
- Steam distillation
- Distillation
- Differential extraction
- Distillation under reduced pressure
- Fractional distillation
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The Correct Option is D
Solution and Explanation
Concept:
Some organic liquids have very high boiling points and may decompose before reaching their normal boiling temperature.
Step 1: Understand boiling point effect.
A liquid boils when its vapour pressure becomes equal to external pressure.
Step 2: Reduce external pressure.
If pressure is reduced, the liquid boils at a lower temperature. Therefore decomposition can be avoided.
Step 3: Choose correct purification method.
The process of distillation at low pressure is called: \[ \text{Distillation under reduced pressure} \] It is also known as vacuum distillation.
Step 4: Final answer.
\[ \boxed{\text{Distillation under reduced pressure}} \]
Hence, correct option is (D).
Some organic liquids have very high boiling points and may decompose before reaching their normal boiling temperature.
Step 1: Understand boiling point effect.
A liquid boils when its vapour pressure becomes equal to external pressure.
Step 2: Reduce external pressure.
If pressure is reduced, the liquid boils at a lower temperature. Therefore decomposition can be avoided.
Step 3: Choose correct purification method.
The process of distillation at low pressure is called: \[ \text{Distillation under reduced pressure} \] It is also known as vacuum distillation.
Step 4: Final answer.
\[ \boxed{\text{Distillation under reduced pressure}} \]
Hence, correct option is (D).
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