| Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as: |
| Assertion (A): Polar molecules have permanent dipole moment. |
| Reason (R): In polar molecule, the centres of positive and negative charges coincide even when there is no external field. |
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 and Reason (R) is also false
Correct Answer: C
Solution :
(c) The molecules of a substance may be polar or non-polar. In a non-polar molecule, the centres of positive and negative charges coincide. This molecule has no permanent dipole moment. On the other hand, a polar molecule is one in which the centres of positive and negative charges are separated, even when there is no external field. Such molecules have a permanent dipole moment.
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