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The fragrance of flowers is due to the p...

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 vapours in vapour phase. A suitable method for the extraction of these oils from the flowers is :

A

Distillation

B

Crystallisation

C

Distillation under reduce pressure

D

steam distillation

Text Solution

Verified by Experts

The correct Answer is:
D
Extraction of oils from flowes is done with the help of steam distillation.
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The fragrnance of flower 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 miscrible with water vapour in vapour phase. A suitable method for the extraction of these oils from the flower is

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Surfactants are the substances which show surface activity .Detergents possess surface activtiy as wll as detergency . Soaps are anionic class of detergents . It is the hydorphilic part of detergent momencule which possesses the tendecy to attract water moleculse wheras hydrophilic blances part orients away from waer . The hydrophilic-lipphilic balance (HLB) leads to affergation of anooic or non-ionic or cationci part of detergent to form icellse . Each molecule has the defintie concentration at defintie temperature at which it states to aggrater . It is due to teh presence of two moities in their molecules, surffactants stabilize emulision ( a water -oil system ) . Due to larger surface area, the mediacines are more effective in emulion form . Emulisons are w//o or o //w type . A water soluble dye imparts its collour to o//w emulsions. Which is incorrect about soaps?

Surfactants are the substances which show surface activity .Detergents possess surface activtiy as wll as detergency . Soaps are anionic class of detergents . It is the hydorphilic part of detergent momencule which possesses the tendecy to attract water moleculse wheras hydrophilic blances part orients away from waer . The hydrophilic-lipphilic balance (HLB) leads to affergation of anooic or non-ionic or cationci part of detergent to form icellse . Each molecule has the defintie concentration at defintie temperature at which it states to aggrater . It is due to teh presence of two moities in their molecules, surffactants stabilize emulision ( a water -oil system ) . Due to larger surface area, the mediacines are more effective in emulion form . Emulisons are w//o or o //w type . A water soluble dye imparts its collour to o//w emulsions. which of the following forms a cationic miclels ?

Surfactants are the substances which show surface activity .Detergents possess surface activtiy as wll as detergency . Soaps are anionic class of detergents . It is the hydorphilic part of detergent momencule which possesses the tendecy to attract water moleculse wheras hydrophilic blances part orients away from waer . The hydrophilic-lipphilic balance (HLB) leads to affergation of anooic or non-ionic or cationci part of detergent to form icellse . Each molecule has the defintie concentration at defintie temperature at which it states to aggrater . It is due to teh presence of two moities in their molecules, surffactants stabilize emulision ( a water -oil system ) . Due to larger surface area, the mediacines are more effective in emulion form . Emulisons are w//o or o //w type . A water soluble dye imparts its collour to o//w emulsions. Select the correct statements . I. Butter is water dispersed in fat II. Milk is fat disperse in water II. Surfactants lower the surface tension of liquie IV. Indigo a dye will impart blue collour to whole butter

Surfactants are the substances which show surface activity .Detergents possess surface activtiy as wll as detergency . Soaps are anionic class of detergents . It is the hydorphilic part of detergent momencule which possesses the tendecy to attract water moleculse wheras hydrophilic blances part orients away from waer . The hydrophilic-lipphilic balance (HLB) leads to affergation of anooic or non-ionic or cationci part of detergent to form icellse . Each molecule has the defintie concentration at defintie temperature at which it states to aggrater . It is due to teh presence of two moities in their molecules, surffactants stabilize emulision ( a water -oil system ) . Due to larger surface area, the mediacines are more effective in emulion form . Emulisons are w//o or o //w type . A water soluble dye imparts its collour to o//w emulsions. Select the correct statements . I. In multimolecular collidal solutiobatoms of momecules are held togenther by va der Waaks' forces Cleansing action of soap is due to adsorption of iliy and gresy material at hydrophilic centres III. Hydorphilic part of oily and greasy materical at hydrophilic centres IV. The aggergation of ions i.e., micelle formation is independt of temeratrue .

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