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Why does NH3 form hydrogen bond but PH3 ...

Why does `NH_3` form hydrogen bond but `PH_3` does not ?

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The electronegativity of N is 3.0, of P is 2.1 and that of hydrogen is 2.1. This difference in electronegativity values make N-H bond polar in nature. However, in `PH_(3)`, P-H bonds form non-polar bonds because both P and H have the same value of electronegativity. Hence, `PH_(3)`, does not form hydrogen bonds.
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