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Classification of Elements and Periodicity

JEE Mains Chemistry. Try each one first, then open its answer.

Top 10 JEE Mains PYQs to practise first

The questions and kinds of question asked most often come first. Each one says how often and in which papers.

  1. Question 1

    This type asked 8 times: 4 Apr 2024, 24 Jan 2025, 21 Jan 2026 S2, 22 Jan 2026 S2, 23 Jan 2026 S2, 24 Jan 2026 S1, 2 Apr 2026 S1, 2 Apr 2026 S2. This one: 2 Apr 2026 S2 See all 8 of this type

    34
    Given below are two statements : Statement-I : The second ionization enthalpy of B,AlB,Al and Ga is in the order of B>Al>GaB > Al > Ga. Statement-II : The correct order in terms of first ionization enthalpy is Si<Ge<Pb<SnSi < Ge < Pb < Sn. In the light of the above statements, choose the correct answer from the options given below :

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  2. Question 2

    This type asked 8 times: 2021 Paper 1, 2021 Paper 17, 25 Jul 2022, 27 Jul 2022, 11 Apr 2023, 29 Jan 2024, 4 Apr 2024, 23 Jan 2026 S1. This one: 23 Jan 2026 S1 See all 8 of this type

    28
    The correct trend in the first ionization enthalpies of the elements in the 3rd 3^{\text{rd~}} period of periodic table is:

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  3. Question 3

    This type asked 6 times: 2021 Paper 26, 25 Jun 2022, 25 Jan 2023, 1 Feb 2023, 6 Apr 2023, 31 Jan 2024. This one: 31 Jan 2024 See all 6 of this type

    40
    The correct sequence of electron gain enthalpy of the elements listed below is (A) ArAr (B) BrBr (C) F (D) SS Choose the most appropriate from the options given below:

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  4. Question 4

    This type asked 5 times: 2021 Paper 16, 2021 Paper 26, 28 Jun 2022, 2 Apr 2026 S2, 5 Apr 2026 S2. This one: 5 Apr 2026 S2 See all 5 of this type

    33
    Given below are two statements : Statement-I : The number of pairs among [Al2O3\left\lbrack {Al}_{2}O_{3} \right.,  Cr2O3],[Cl2O7,Mn2O7],[Na2O,V2O3]\left. \ {Cr}_{2}O_{3} \right\rbrack,\left\lbrack {Cl}_{2}O_{7},{Mn}_{2}O_{7} \right\rbrack,\left\lbrack {Na}_{2}O,V_{2}O_{3} \right\rbrack and [CO\lbrack CO,  N2O]\left. \ N_{2}O \right\rbrack that contain oxides of same nature (acidic, basic, neutral or amphoteric) is 4. Statement-II : Among Na2O,Al2O3,CO{Na}_{2}O,{Al}_{2}O_{3},CO and Cl2O7{Cl}_{2}O_{7}, the most basic and acidic oxides are Na2O{Na}_{2}O and Cl2O7{Cl}_{2}O_{7}, respectively. In the light of the above statements, choose the correct answer from the options given below:

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  5. Question 5

    This type asked 5 times: 2021 Paper 14, 2021 Paper 21, 27 Jun 2022, 31 Jan 2023, 5 Apr 2024. This one: 5 Apr 2024 See all 5 of this type

    35
    The statement(s) that are correct about the species O2−,F−,Na+O^{2 -},F^{-},Na^{+}and Mg2+Mg^{2 +}. (A) All are isoelectronic (B) All have the same nuclear charge (C) O2−O^{2 -} has the largest ionic radii (D) Mg2+Mg^{2 +} has the smallest ionic radii Choose the most appropriate answer from the options given below:

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  6. Question 6

    This type asked 4 times: 2021 Paper 25, 29 Jul 2022, 22 Jan 2026 S1, 8 Apr 2026 S2. This one: 8 Apr 2026 S2 See all 4 of this type

    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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  7. Question 7

    This type asked 4 times: 2021 Paper 12, 28 Jun 2022, 30 Jan 2023, 4 Apr 2026 S1. This one: 4 Apr 2026 S1 See all 4 of this type

    33
    A monoatomic anion (A−)\left( A^{-} \right)has 45 neutrons and 36 electrons. Atomic mass, group in the periodic table and physical state at room temperature of the element (A) respectively are :

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  8. Question 8

    This type asked 4 times: 28 Jul 2022, 25 Jan 2023, 10 Apr 2023, 28 Jan 2026 S2. This one: 28 Jan 2026 S2 See all 4 of this type

    28
    Consider the elements N,P,O,S,ClN,P,O,S,Cl and F. The number of valence electrons present in the elements with most and least metallic character from the above list is respectively.

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  9. Question 9

    This type asked 4 times: 14 Jun 2022, 25 Jul 2022, 29 Jan 2023, 1 Feb 2024. This one: 1 Feb 2024 See all 4 of this type

    58
    Among the following oxide of pp - block elements, number of oxides having amphoteric nature is Cl2O7,CO,PbO2, N2O,NO,Al2O3,SiO2, N2O5Cl_{2}O_{7},CO,PbO_{2},{\text{ }N}_{2}O,NO,Al_{2}O_{3},SiO_{2},{\text{ }N}_{2}O_{5}, SnO2SnO_{2}

  10. Question 10

    This type asked 3 times: 28 Jan 2025, 7 Apr 2025, 28 Jan 2026 S1. This one: 28 Jan 2026 S1 See all 3 of this type

    44
    In period 4 of the periodic table, the elements with highest and lowest atomic radii are respectively.

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