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प्रश्न
The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapour in vapour phase. A suitable method for the extraction of these oils from the flowers is ______.
विकल्प
Distillation
Crystallisation
Distillation under reduced pressure
Steam distillation
उत्तर
The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapour in vapour phase. A suitable method for the extraction of these oils from the flowers is steam distillation.
Explanation:
This technique is applied to separate substances which are steam volatile and are immiscible with water. In steam distillation, steam from a steam generator is passed through a heated flask containing the liquid to be distilled. The mixture of steam and the volatile organic compound is condensed and collected. The compound is later separated from water using a separating funnel.
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संबंधित प्रश्न
Explain, why an organic liquid vaporises at a temperature below its boiling point in its steam distillation?
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A liquid which decomposes at its boiling point can be purified by ______.
Assertion: \[\begin{array}{cc}
\ce{CH - C = CH - COOH}\\|\phantom{.}\\
\phantom{........}\ce{COOC2H5}\end{array}\]
Reason: The principal functional group gets lowest number followed by double bond (or) triple bond.
Explain paper chromatography.
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Reason (R): The coloured components of inks migrate at different rates because paper selectively retains different components according to the difference in their partition between the two phases.
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