A ' p '-block element (E) and hydrogen form a binary cation 
, while 
on treatment with 
in alkaline medium gives a precipitate of basic mercury(II)amido-iodine. Given below are first ionisation enthalpy values 
for first element each from group 13, 14, 15 and 16. Identify the correct first ionisation enthalpy value for element E .
Text Solution
Verified by ExpertsB
The p -block element E forms a binary cation 
with hydrogen and produces a basic mercury(II) amido-iodide precipitate with 
in alkaline medium.
This behavior is characteristic of ammonia 
, which forms the ammonium ion 
and reacts with Nessler's reagent 
to form a characteristic brown/yellow precipitate.
Therefore, E is Nitrogen 
, a Group 15 p -block element with electronic configuration 
.
Nitrogen has a notably high first ionization enthalpy compared to other group 15 elements due to:
Small atomic radius
High effective nuclear charge
Stable half-filled 
subshell configuration
The first ionization enthalpy of nitrogen is 
.
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