Which of the following statements is NOT correct about polarisation of an atom, ion or molecule?
A. An atom, ion or polar molecule has zero dipole moment in a zero field
B. the permanent dipole moment of polar molecules are randomly oriented in zero field
C. in the presence of a field the orientation of polar molecules in which the dipole moment is parallel to the field have
lower energy and so are statistically more favourable
D. in an ionic lattice the positive ions are displaced in the direction opposite to the field
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