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Assign first ionisation enthalpy values to given elements or configurations

This type of question, asked 4 times: 2021 Paper 25, 29 Jul 2022, 22 Jan 2026 S1, 8 Apr 2026 S2. All 4 questions below, oldest first.

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  1. Question 1

    2021 Paper 25

    46
    Match List-I with List-II. List -I List-II Electronic ΔiH\Delta_{i}H in kJmol−1kJmol^{- 1} configuration of elements (A) 1s22s21s^{2}2s^{2} (i) 801 (B) 1s22s22p41s^{2}2s^{2}2p^{4} (ii) 899 (C) 1s22s22p31s^{2}2s^{2}2p^{3} (iii) 1314 (D) 1s22s22p11s^{2}2s^{2}2p^{1} (iv) 1402

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  2. Question 2

    29 Jul 2022

    34
    The first ionization enthalpy of Na,MgNa,Mg and SiSi, respectively, are: 496,737 and 786 kJ mol−1786\text{ }kJ{\text{ }mol}^{- 1}. The first ionization enthalpy (kJmol−1)\left( kJmol^{- 1} \right) of AlAl is:

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  3. Question 3

    22 Jan 2026 S1

    30
    A 'p'-block element (E) and hydrogen form a binary cation (EHx)+\left( EH_{x} \right)^{+}, while EH3EH_{3} on treatment with K2HgI4K_{2}HgI_{4} in alkaline medium gives a precipitate of basic mercury(II) amido-iodide. Given below are first ionisation enthalpy values ( kJmol−1kJmol^{- 1} ) for first element each from group 13, 14, 15 and 16. Identify the correct first ionisation enthalpy value for element E .

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  4. Question 4

    8 Apr 2026 S2

    33
    Match List-I with List-II.
    List-I Electronic configuration of neutral atom (where n=2n = 2)List-II 1st1^{st} Ionization Energy (kJ mol−1kJ\,mol^{-1})
    (A)ns2{ns}^{2}(I)2080
    (B)ns2np1ns^{2}np^{1}(II)899
    (C)ns2np3ns^{2}np^{3}(III)800
    (D)ns2np6ns^{2}np^{6}(IV)1402
    Choose the correct answer from the options given below :

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