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Which of the following have zero dipole moment ? $(i)\; H_2;\; (ii)\;HF;\; (iii)\; CH_4; \; (iv) CHCl_3$

$ (a)\;(i)\; and\;(iii) \\ (b) \; (ii)\;and \;(iii) \\ (c) \;(i)\;and \;(iv) \\ (d)\;(ii)\;and (iv) $
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Homonuclear species as well as a species where central atom is attached to same atom has zero dipole moment.
Hence a is the correct answer.
answered Feb 28, 2014 by meena.p

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