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Day 406: JEE Mains Chemistry

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

  1. Question 1

    Some Basic Concepts of Chemistry. Asked once: 28 Jan 2025

    27
    Given below are two statements : Statement I : In the oxalic acid vs KMnO4KMnO_{4} (in the presence of dil H2SO4H_{2}SO_{4} ) titration the solution needs to be heated initially to 60∘C60^{\circ}C, but no heating is required in Ferrous ammonium sulphate (FAS) vs KMnO4KMnO_{4} titration (in the presence of dil H2SO4H_{2}SO_{4} ) Statement II : In oxalic acid vs KMnO4KMnO_{4} titration, the initial formation of MnSO4MnSO_{4} takes place at high temperature, which then acts as catalyst for further reaction. In the case of FAS vs KMnO4KMnO_{4}, heating oxidizes Fe2+Fe^{2 +} into Fe3+Fe^{3 +} by oxygen of air and error may be introduced in the experiment. In the light of the above statements, choose the correct answer from the options given below :

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  2. Question 2

    Structure of Atom. Asked once: 21 Jan 2026 S1

    45
    Given below are two statements: Statement I: When an electric discharge is passed through gaseous hydrogen, the hydrogen molecules dissociate and the energetically excited hydrogen atoms produce electromagnetic radiation of discrete frequencies. Statement II: The frequency of second line of Balmer series obtained from He+{He}^{+}is equal to that of first line of Lyman series obtained from hydrogen atom. In the light of the above statements, choose the correct answer from the options given below:

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  3. Question 3

    The d- and f-Block Elements. Asked once: 7 Apr 2025

    36
    The number of valence electrons present in the metal among Cr,Co,FeCr,Co,Fe and Ni which has the lowest enthalpy of atomisation is:

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  4. Question 4

    The p-Block Elements. Asked once: 23 Jan 2026 S2

    31
    Elements X and Y belong to Group 15. The difference between the electronegativity values of ' X ' and phosphorus is higher than that of the difference between phosphorus and ' Y '. ' X ' & ' Y ' are respectively

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  5. Question 5

    Alcohols, Phenols and Ethers. Asked once: 24 Jan 2026 S2

    41
    From the following, how many compounds contain at least one secondary alcohol ? (I) (II) (III) (IV) (V) (VI) Choose the correct answer from the options given below :

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