Q109 / 150 · MHT CET 2026 (20 April Shift 2) · Physics
Select the 'WRONG' statement about polar molecules.
- AA molecule in which centre of mass of positive charges does not coincide with the centre of mass of negative charges is a polar molecule.
- BThey have permanent dipole moment.
- CThey act as tiny electric dipoles.
- Correct answerDThey have symmetrical shape.
Solution
A polar molecule is one in which the centre of mass of positive charges does not coincide with the centre of mass of negative charges.
Because of this separation of charges, polar molecules possess a permanent electric dipole moment and act as tiny electric dipoles.
For a molecule to be polar, its individual bond dipoles must not cancel each other out, which typically requires an asymmetrical shape. Symmetrical molecules generally have a net zero dipole moment and are non-polar.
Therefore, the statement that polar molecules have a symmetrical shape is incorrect.
Answer: They have symmetrical shape.
Because of this separation of charges, polar molecules possess a permanent electric dipole moment and act as tiny electric dipoles.
For a molecule to be polar, its individual bond dipoles must not cancel each other out, which typically requires an asymmetrical shape. Symmetrical molecules generally have a net zero dipole moment and are non-polar.
Therefore, the statement that polar molecules have a symmetrical shape is incorrect.
Answer: They have symmetrical shape.
Hence, the correct answer is option: 'D'.