Question

DIRECTION : In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion(A).
(b) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
(c) Assertion (A) is true but reason (R) is false.
(d) Assertion (A) is false but reason (R) is true.

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.
Ans : (a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A)

3. Assertion : A solution of table salt in a glass of water is homogeneous.
Reason : A solution having different composition throughout is homogeneous.

4. Assertion : A mixture of sugar and benzoic acid can be separated by shaking with ether.
Reason : Sugar is insoluble in water.

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.

6. Assertion : True solution exhibits Tyndall effect.
Reason : Particles are very large in size.

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.

8. Assertion : A solution of table salt in a glass of water is homogeneous.
Reason : A solution having different composition throughout is homogeneous.

9. Assertion : Impure benzoic acid can be purified by sublimation.
Reason : Benzoic acid sublimes on heating.

10. Assertion : Tyndall effect is an optical property.
Reason : Electrophoresis is an electrical property.

11. Assertion : A mixture of acetone and methanol can be separated by fractional distillation.
Reason : The difference between their boiling points is very less.

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.

13. Assertion : A mixture of camphor and ammonium chloride cannot be separated by sublimation.
Reason : Camphor on heating sublimes, ammonium chloride does not.

14. Assertion : A mixture of glucose and m-dinitrobenzene can be separated by shaking it with ether.
Reason : Glucose is soluble in water.

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.​

Answer 1

2 =A

3=C

4=C

5=b

6=d

7=A

8=C

9=A

10=b

11=A

12=C

13=C

14=B

15=b

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