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p-Block Elements – II — Chemistry STD 12 — Question

Tamilnadu BoardEnglish MediumSTD 12Chemistryp-Block Elements – II3 Marks
Question
Why does $NH _3$ form a hydrogen bond but $PH _3$ does not?
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Answer

The electronegativity of N (3.0) is much higher than that of FI (2.1). As a result, N – H bond is quite polar and hence $NH_3$ undergoes intermolecular H-bonding. In contrast, both P and H have an electronegativity of 2.1. Therefore P – H bond is non-polar and hence $PH_3$ does not undergo H – bonding.

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