A 'p'-block element (E) and hydrogen form a binary cation $\left( {EH}_{x} \right)^{+}$, while ${EH}

Question

A 'p'-block element (E) and hydrogen form a binary cation $\left( {EH}_{x} \right)^{+}$, while ${EH}_{3}$ on treatment with $K_{2}{HgI}_{4}$ in alkaline medium gives a precipitate of basic mercury(II)amido-iodine. Given below are first ionisation enthalpy values ( $kJ{mol}^{- 1}$ ) for first element each from group 13, 14, 15 and 16. Identify the correct first ionisation enthalpy value for element E .

Accepted Answer

Element E is N , the species is ${NH}_{4}^{+}$, among $B,C$, N and $O,N$ has highest first ionization energy.

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