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Which uot of the following pairs has dip...

Which uot of the following pairs has dipole moment ?
(i) `BF_(3) and NCl_(3)` (ii) `H_(2)Oand BF_(3)` (iii) `CO_(2) and H_(2)S`

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The correct Answer is:
(i) `NCl_(3)` (ii) `H_(2)O` (iii) `H_(2)S`
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