States of Matter - Result Question 5
####5. Dipole-induced dipole interactions are present in which of the following pairs : [NEET 2013]
(a) $Cl_2$ and $CCl_4$
(b) $HCl$ and $He$ atoms
(c) $SiF_4$ and $He$ atoms
(d) $H_2 O$ and alcohol
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Solution:
- (b) $HCl$ is polar $(\mu \neq 0)$ and He is non-polar $(\mu=0)$, thus gives dipole-induced dipole interaction.
Induced dipole forces result when an ion or a dipole induces a dipole in an atom or a molecule with no dipole. These are weak forces. These are of two types namely. Ion-induced dipole force and dipoleinduced force. Ion-induced dipole force: when the approach of an ion induces a dipole in an atom by disturbing the arrangement of electrons. Dipole induced dipole force: when a polar molecule induces a dipole in an atom or in a non-polar molecule.
