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- Which of the following statement is correct?Option: 1 PH3 has lower boiling point than NH3<div class='qna-op
Which of the following statement is correct?
PH3 has lower boiling point than NH3
NH3 has lower boiling point than PH3
Nitrogen is less electronegative than Phosphorus
All of these
Answers (1)
As we have learnt,
Reactivity towards halogens
These elements react to form two series of halides: EX3 and EX5. Nitrogen does not form pentahalide due to non-availability of the d orbitals in its valence shell. Pentahalides are more covalent than trihalides. This is due to the fact that in pentahalides +5 oxidation state exists while in the case of trihalides +3 oxidation state exists. Since elements in +5 oxidation state will have more polarising power than in +3 oxidation state, the covalent character of bonds is more in pentahalides. All the trihalides of these elements except those of nitrogen are stable. In case of nitrogen, only NF3 is known to be stable. Trihalides except BiF3 are predominantly covalent in nature.
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Nitrogen is more electronegative than phosphorus and hence capable of forming hydrogen bonds. Due to the association of NH3 molecules by hydrogen bonding, ammonia has a higher boiling point. On the other hand, due to the absence of hydrogen bonding in PH3 molecules are not associate and PH3 has a lower boiling point than NH3
Therefore, Option(1) is correct
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