A 'p'-block element (E) and hydrogen form a binary cation ${\left({\text{EH}}_{\text{x}}\right)}^{+}$, while EH₃ on treatment with K₂HgI₄ in alkaline medium gives a precipitate of basic mercury(II) amido-iodine. Given below are first ionisation enthalpy values $\left({\text{kJmol}}^{−1}\right)$ for first element each from group 13, 14, 15 and 16. Identify the correct first ionisation enthalpy value for element E.

[JEE Main 2026, 22 Jan (Shift 2)]

Question

A 'p'-block element (E) and hydrogen form a binary cation ${\left({\text{EH}}_{\text{x}}\right)}^{+}$, while EH₃ on treatment with K₂HgI₄ in alkaline medium gives a precipitate of basic mercury(II) amido-iodine. Given below are first ionisation enthalpy values $\left({\text{kJmol}}^{−1}\right)$ for first element each from group 13, 14, 15 and 16. Identify the correct first ionisation enthalpy value for element E.

[JEE Main 2026, 22 Jan (Shift 2)]

YESPYQ · Accepted Answer

Correct answer: d) 1402. Element E is N, the species is ${\text{NH}}_{4}^{+}$, among B, C, N and O, N has highest first ionization energy.

A 'p'-block element (E) and hydrogen form a binary cation \({\left({\text{EH}}_{\text{x}}\right)}^{+}\), while EH 3 on t…

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