A) all diatomic molecules are polar
B) ammonia,\[N{{H}_{3}}\]and boron trichloride,\[BC{{l}_{3}}\]are both polar molecules
C) all polar diatomic molecules are composed of two different elements
D) all molecules of the type\[A{{B}_{4}}\]are polar
Correct Answer: C
Solution :
: In homonuclear diatomic molecules, the shared electrons are equally attracted to both the nuclei and therefore spend equal amounts of time near each nucleus. As a result, the molecule is neutral or non-polar. However in case of heteronuclear diatomic molecule, both the atoms joined by the covalent bond possess different electronegativity. As a result, the atom having higher value of electronegativity attracts the shared electron pair much more strongly than the other atom and the molecule becomes polar.
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