Assertion : When a beam of light is passed through a colloidal solution placed in a dark place the path of the beam becomes visible.
Reason : Light gets scattered by the colloidal particles.
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Q.2. Assertion : A mixture of benzoic acid and naphthalene can be separated by crystallization from water.
Reason : Benzoic acid is soluble in hot water but naphthalene is insoluble in hot water.
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Q.3. Assertion : A solution of table salt in a glass of water is homogeneous.
Reason : A solution having different composition throughout is homogeneous.
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Q.4. Assertion : A mixture of sugar and benzoic acid can be separated by shaking with ether.
Reason : Sugar is insoluble in water.
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Q.5. Assertion : In sublimation, a substance changes directly from solid to vapour without passing through
liquid state and vice-versa.
Reason : Distillation involves two processes i.e., vaporisation and condensation.
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Q.6. Assertion : True solution exhibits Tyndall effect.
Reason : Particles are very large in size.
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Q.7. Assertion : Colloidal solutions are stable and the colloidal particles do not settle down.
Reason : Brownian movement counters the force of gravity acting on colloidal particles.
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Q.8. Assertion : A solution of table salt in a glass of water is homogeneous.
Reason : A solution having different composition throughout is homogeneous.
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Q.9. Assertion : Impure benzoic acid can be purified by sublimation.
Reason : Benzoic acid sublimes on heating.
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Q.10. Assertion : Tyndall effect is an optical property.
Reason : Electrophoresis is an electrical property.
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Q.11. Assertion : A mixture of acetone and methanol can be separated by fractional distillation.
Reason : The difference between their boiling points is very less.
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Q.12. Assertion : Chloroform and benzene form a pair of miscible liquids and they are separated by fractional
distillation.
Reason : Boiling point of benzene is less than that of chloroform.
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Q.13. Assertion : A mixture of camphor and ammonium chloride cannot be separated by sublimation.
Reason : Camphor on heating sublimes, ammonium chloride does not.
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Q.14. Assertion : A mixture of glucose and m-dinitrobenzene can be separated by shaking it with ether.
Reason : Glucose is soluble in water.
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Q.15. Assertion : Hot water is used for separation of benzoic acid from naphthalene.
Reason : Whenever a crystal is formed it tends to leave out the impurities.
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Assertion and reason
Explanation:
- When a beam of light is passed through a colloidal solution, placed in a dark room the beam of light is scattered by the colloidal particles and the path of the beam becomes visible, this is called tyndall effect.
- Benzoic acid dissolves in hot water but napthalene does not therefore, hot water is used for separation of benzoic acid from napthalene.
- Assertion is true but the reason is false, a homogeneous solution remains identical throughout and a salt solution is homogeneous solution.
- Sugar is soluble in water.
- Assertion is correct but the reason is not the correct explanation.
- True solution does not exhibit tyndall effect it is only shown by colloidal solution.
- The colloidal solution is stable because the particles of the colloidal solution repel each other due to identical and equivalent charges hence they do not settle down.
- All solutions would be considered homogeneous because the dissolved material is present in the same amount throughout the solution.
- Benzoic acid sublimes on heating while impurities do not.
- When a beam of light is passed through a colloidal solution kept in dark, the path of the beam gets illuminated with blue colour, this is tyndall effect and it shows optical property
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