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Day 26: JEE Mains Chemistry

5 questions. Try each one first, then open its answer.

  1. Question 1

    Classification of Elements and Periodicity. 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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  2. Question 2

    Amines. This type asked 5 times: 2021 Paper 13, 29 Jun 2022, 26 Jul 2022, 31 Jan 2024, 1 Feb 2024. This one: 1 Feb 2024 See all 5 of this type

    50
    Given below are two statements: Statement (I): The NH2NH_{2} group in Aniline is ortho and para directing and a powerful activating group. Statement (II): Aniline does not undergo Friedel- Craft's reaction (alkylation and acylation). In the light of the above statements, choose the most appropriate answer from the options given below:

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  3. Question 3

    Electrochemistry. This type asked 5 times: 2021 Paper 25, 28 Jun 2022, 26 Jul 2022, 31 Jan 2024, 1 Feb 2024. This one: 1 Feb 2024 See all 5 of this type

    147
    The amount of electricity in Coulomb required for the oxidation of 1 mol1\text{ }mol of H2OH_{2}O to O2O_{2} is ______ ×105C\times10^{5}C.

  4. Question 4

    Some Basic Concepts of Chemistry. This type asked 5 times: 2021 Paper 23, 26 Jun 2022, 26 Jul 2022, 30 Jan 2024, 1 Feb 2024. This one: 1 Feb 2024 See all 5 of this type

    34
    Which of the following reactions are disproportionation reactions? (A) Cu+→Cu2++CuCu^{+}\rightarrow Cu^{2 +}+ Cu (B) 3MnO42−+4H+→2MnO4−+MnO2+2H2O3MnO_{4}^{2 -}+ 4H^{+}\rightarrow 2MnO_{4}^{-}+MnO_{2}+ 2H_{2}O (C) 2KMnO4→K2MnO4+MnO2+O22KMnO_{4}\rightarrow K_{2}MnO_{4}+MnO_{2}+O_{2} (D) 2MnO4−+3Mn2++2H2O→5MnO2+4H+2MnO_{4}^{-}+ 3Mn^{2 +}+ 2H_{2}O \rightarrow 5MnO_{2}+ 4H^{+} Choose the correct answer from the options given below:

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  5. Question 5

    Some Basic Concepts of Chemistry. This type asked 5 times: 8 Apr 2023, 13 Apr 2023, 29 Jan 2024, 30 Jan 2024, 1 Feb 2024. This one: 1 Feb 2024 See all 5 of this type

    33
    In acidic medium, K2Cr2O7K_{2}Cr_{2}O_{7} shows oxidising action as represented in the half reaction
    Cr2O72−+XH++Ye−→2 A+ZH2OCr_{2}O_{7}^{2 -}+XH^{+}+Ye^{-}\rightarrow 2\text{ }A +ZH_{2}O
    X,Y,ZX,Y,Z and AA are respectively are:

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