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Question
Why does NH3 form hydrogen bond but PH3 does not?
Why does NH3 form hydrogen bond but PH3 does not?
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Solution
Electronegativity values; N=3.0; P=2.1; H=2.1. Nitrogen and hydrogen have a considerable difference in their electronegativity values so they form covalent bond having polar nature. That is why H-bonding exists among NH3 molecules.
Phosphorus and hydrogen have equal values of electronegativity, that's why covalent bond P-H is non-polar. Therefore, H-bonding does not exist among PH3 molecules.
Electronegativity values; N=3.0; P=2.1; H=2.1. Nitrogen and hydrogen have a considerable difference in their electronegativity values so they form covalent bond having polar nature. That is why H-bonding exists among NH3 molecules.
Phosphorus and hydrogen have equal values of electronegativity, that's why covalent bond P-H is non-polar. Therefore, H-bonding does not exist among PH3 molecules.
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