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Day 212: JEE Mains Chemistry

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

  1. Question 1

    Chemical Bonding and Molecular Structure. Asked once: 27 Jul 2022 (same type asked 9 times) See all 9 of this type

    55
    According to MO theory, number of species/ions from the following having identical bond order is CN−,NO+,O2,O2+,O22+CN^{-},NO^{+},O_{2},O_{2}^{+},O_{2}^{2 +}

  2. Question 2

    Some Basic Concepts of Chemistry. Asked once: 27 Jan 2024 (same type asked 9 times) See all 9 of this type

    146
    Volume of 3MNaOH3MNaOH (formula weight 40 g mol−140\text{ }g{\text{ }mol}^{- 1} ) which can be prepared from 84 g84\text{ }g of NaOHNaOH is _____ ×10−1dm3\times10^{- 1}dm^{3}.

  3. Question 3

    Organic Chemistry - Some Basic Principles and Techniques. Asked once: 21 Jan 2026 S1 (same type asked 8 times) See all 8 of this type

    41
    Identify correct statement from the following : (A) Propanal and propanone are functional isomers. (B) Ethoxyethane and methoxypropane are metamers. (C) But-2-ene shows optical isomerism. (D) But-1-ene and but-2-ene are functional isomers. (E) Pentane and 2, 2-dimethyl propane are chain isomers. Choose the correct answer from the options given below :

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  4. Question 4

    Structure of Atom. Asked once: 24 Jan 2026 S1 (same type asked 8 times) See all 8 of this type

    48
    The hydrogen spectrum consists of several spectral lines in Lyman series (L1, L2, L3….;L1\left( L_{1},{\text{ }L}_{2},{\text{ }L}_{3}\ldots.;L_{1} \right. has lowest energy among Lyman series). Similarly it consists of several spectral lines in Balmer series ( B1, B2B_{1},{\text{ }B}_{2}, B3…….;B1B_{3}\ldots\ldots.;B_{1} has lowest energy among Balmer lines). The energy of L1L_{1} is x times the energy of B1B_{1}. The value of xx is ____\_\_\_\_ ×10−1\times 10^{- 1} (Nearest integer)

  5. Question 5

    Organic Chemistry - Some Basic Principles and Techniques. Asked once: 28 Jan 2026 S2 (same type asked 8 times) See all 8 of this type

    45
    A student has been given 0.314 g of an organic compound and asked to estimate Sulphur. During the experiment, the student has obtained 0.4813 g of barium sulphate. The percentage of Sulphur present in the compound is ____\_\_\_\_ . (Given Molar mass in gmol−1 S:32,BaSO4:233gmol^{- 1}\text{ }S:32,BaSO_{4}:233 )

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