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The most nonpolar of all the molecules you listed would be NH3. It is nonpolar because there is not a significant difference in the electronegativities of its atoms and the atoms are arranged in a symmetrical shape. CH3Cl is polar because the chlorine atom is more electronegative than the three hydrogen atoms. H2O is polar because the hydrogen atoms are less electronegative than the oxygen atom. The same applies to OF2, except in this case the fluorine atoms are more electronegative than oxygen. BeCl2is an ionic compound, not a molecule. Because of this, there is a VERY great difference in the electronegativity of the two atoms. Ionic compounds are NEVER nonpolar.

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Q: Which of the following molecules in non polar CH3Cl or H2O or OF2 or BeCl2 or NH3?
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