1.

Iron cannot form complexes with ammonia because

Answer»

In alkaline solution, iron salts are precipitated as their hydroxides which are insoluble in excess of alkali
In acid solutions, `NH_(3)` cannot form complex because of protonation it changes to `NH_(4)^(+)` ION which have no donar site.
In the presence of ammonia, iron nitrides are formed
In solution aqua complexes of iron salts are produced which PROTECTS the IONS of iron.

Solution :In `Cl^(-)` acid medium `NH_(3)` is converted `NH_(4)^(+)` which contain no electron for DONATE.


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