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Which of the following molecules is polar?
1. CH4
2. BH3
3. NH3
4. CF4
5. H2

  • chemistry -

    To be polar, molecules must have the following:
    1. There must be a difference in electronegativity between the central element and the binding element(s).
    2. The molecules must NOT be symmetrical.
    CH4, for example, has a small difference in EN between C and H, but it is tetrahedral which makes it symmetrical and the CH4 molecule as a whole has no dipole moment.

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