Differences between ammonia (NH3) and phosphine ( PH3)

S.N        NH3       PH3
1. It is lighter than air. It is heavier than air.
2. It is not poisonous. It is highly poisonous.
3. It forms H-bonding. It does not form H-bonding.
4. It is highly soluble in water. It is sparingly soluble in water.
5. Its aqueous solution is alkaline. Its aqueous solution is neutral.
6. It forms NH4OH i.e. stable It forms PH4OH i.e. unstable.
7. It forms complexes. It does not form complexes.
8. Its bond angle is 107º. Its   bond angle is 93º.
9. It is called ammonia (azane). It is called phosphine (phosphane).
10. It is a compound of nitrogen. It is a compound of phosphorous.
11. It has higher boiling point. It has less boiling point.
12.     2Na + 2NH3 → 2NaNH2 + H2 6Na + 2PH3 → 2Na3P + 3H2
13. It burns in excess of air or oxygen giving nitrogen and water.


4NH3 + 3O2 → 2N2 + 6H2O

It burns in oxygen yielding phosphorous pentoxide and water.


2PH3 + 4O2 → P2O5 + 3H2O

14. It forms stable salts known as ammonium salts. It forms unstable salts known as phosphonium salt.
15. It precipitates out metals from their aqueous salt solution as metallic hydrides.

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It precipitates out metals from their salt solution as metallic phosphides.

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i) https://www.sciencedirect.com/science/article/abs/pii/S2210271X18305000

ii) https://byjus.com/jee-questions/why-does-ammonia-has-higher-boiling-point-than-phosphine/

Differences between ammonia (NH3) and phosphine ( PH3)