A 'p'-block element $(\mathrm{E})$ and hydrogen form a binary cation $\left(\mathrm{EH}_{\mathrm{x}}\right)^{+}$, while $\mathrm{EH}_3$ on treatment with $\mathrm{K}_2 \mathrm{HgI}_4$ in alkaline medium gives a precipitate of basic mercury(II)amido-iodine. Given below are first ionisation enthalpy values $\left(\mathrm{kJmol}^{-1}\right)$ for first element each from group $13,14,15$ and 16 . Identify the correct first ionisation enthalpy value for element E .
Select the correct option:
A
1312
B
1086
C
1402
D
801
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
Element E is N , the species is $\mathrm{NH}_4^{+}$, among $\mathrm{B}, \mathrm{C}$, N and $\mathrm{O}, \mathrm{N}$ has highest first ionization energy.
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