Question

Assertion : Polar molecules have permanent dipole moment
Reason : In polar molecule, the centres of positive and negative charges coincide even when there is no external field

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (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