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ChemistryJEE Main 22 Jan 2026, Shift 1·Q5·MCQ·Easy–moderate

Classification & Periodicity · First ionisation enthalpy values

A ‘p'-block element (E) and hydrogen form a binary cation (EHXx)X+\ce{(EH_x)^+}, while EHX3\ce{EH3} on treatment with KX2HgIX4\ce{K2HgI4} in alkaline medium gives a precipitate of basic mercury(II)amido-iodine. Given below are first ionisation enthalpy values (kJ mol−1^{-1}) for first element each from group 13, 14, 15 and 16. Identify the correct first ionisation enthalpy value for element E.
  1. (1)1312
  2. (2)1086
  3. (3)1402
  4. (4)801

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See the full 22 Jan 2026, Shift 1 paper