1.

Which of the following molecule is nonpolar? (i) `PbCl_4` (ii) `BF_3` (iii) `SnCl_2` (iv) `CS_2`A. (i), (ii), (iii)B. (i), (ii), (iii), (iv)C. (i), (ii), (iv)D. (ii), (iii), (iv)

Answer» Correct Answer - C
Molecules with symmetrical shapes have zero dipole moments. `PbCl_4` is regular tetrahedron, `BF_3` is trigonal planar, while `CS_2` is linear. All have zero dipole moment and, hence, are nonpolar. On the other hand, `SnCl_2` is a bent molecule. Thus, its bond dipoles do not cancel and `SnCl_2` is a polar molecule.


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