Class 9 Exam > Class 9 Questions > Naphthalene can be separated from sand:a)By ...
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Naphthalene can be separated from sand:
- a)By sublimation
- b)By crystallization
- c)By distillation
- d)Using suitable solvent
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Naphthalene can be separated from sand:a)By sublimationb)By crystalli...
Separation of Naphthalene from Sand
Naphthalene, a polycyclic aromatic hydrocarbon, possesses unique physical properties that allow it to be separated effectively from sand using sublimation.
What is Sublimation?
- Sublimation is the process where a solid transitions directly into a gas without passing through the liquid state.
- Naphthalene has a relatively low boiling point (approximately 218°C) and readily sublimates upon heating.
Why is Sublimation Effective for Separation?
- Physical Properties: When naphthalene is heated, it vaporizes, leaving sand, which does not change phase.
- Recondensation: The vapor can be cooled, often on a cold surface, allowing naphthalene to solidify again, effectively collecting it separately from sand.
Steps in the Sublimation Process
- Heating the Mixture: The sand-naphthalene mixture is gently heated.
- Vaporization: Naphthalene vaporizes due to heat.
- Condensation: The vapor is directed onto a cooler surface where it condenses back into solid naphthalene.
- Collection: The solid naphthalene can be collected, leaving sand behind.
Comparison with Other Methods
- Crystallization: This is not suitable since it relies on solubility, while sand is insoluble in naphthalene.
- Distillation: This method separates liquids based on boiling points and is not applicable for a solid-sand mixture.
- Using a Suitable Solvent: This would not work well since sand does not dissolve in solvents typically used for naphthalene.
In conclusion, sublimation is the most efficient method to separate naphthalene from sand due to its unique phase change properties.
Naphthalene, a polycyclic aromatic hydrocarbon, possesses unique physical properties that allow it to be separated effectively from sand using sublimation.
What is Sublimation?
- Sublimation is the process where a solid transitions directly into a gas without passing through the liquid state.
- Naphthalene has a relatively low boiling point (approximately 218°C) and readily sublimates upon heating.
Why is Sublimation Effective for Separation?
- Physical Properties: When naphthalene is heated, it vaporizes, leaving sand, which does not change phase.
- Recondensation: The vapor can be cooled, often on a cold surface, allowing naphthalene to solidify again, effectively collecting it separately from sand.
Steps in the Sublimation Process
- Heating the Mixture: The sand-naphthalene mixture is gently heated.
- Vaporization: Naphthalene vaporizes due to heat.
- Condensation: The vapor is directed onto a cooler surface where it condenses back into solid naphthalene.
- Collection: The solid naphthalene can be collected, leaving sand behind.
Comparison with Other Methods
- Crystallization: This is not suitable since it relies on solubility, while sand is insoluble in naphthalene.
- Distillation: This method separates liquids based on boiling points and is not applicable for a solid-sand mixture.
- Using a Suitable Solvent: This would not work well since sand does not dissolve in solvents typically used for naphthalene.
In conclusion, sublimation is the most efficient method to separate naphthalene from sand due to its unique phase change properties.
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Community Answer
Naphthalene can be separated from sand:a)By sublimationb)By crystalli...
You can separate the sublimating substance (Naphthalene / Anthracene / Camphor / Ammonium chloride) from the mixture through the process of sublimation.
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Naphthalene can be separated from sand:a)By sublimationb)By crystallizationc)By distillationd)Using suitable solventCorrect answer is option 'A'. Can you explain this answer? for Class 9 2025 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about Naphthalene can be separated from sand:a)By sublimationb)By crystallizationc)By distillationd)Using suitable solventCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 9 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Naphthalene can be separated from sand:a)By sublimationb)By crystallizationc)By distillationd)Using suitable solventCorrect answer is option 'A'. Can you explain this answer?.
Naphthalene can be separated from sand:a)By sublimationb)By crystallizationc)By distillationd)Using suitable solventCorrect answer is option 'A'. Can you explain this answer? for Class 9 2025 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about Naphthalene can be separated from sand:a)By sublimationb)By crystallizationc)By distillationd)Using suitable solventCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 9 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Naphthalene can be separated from sand:a)By sublimationb)By crystallizationc)By distillationd)Using suitable solventCorrect answer is option 'A'. Can you explain this answer?.
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