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Day 280: JEE Mains Chemistry

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

  1. Question 1

    Chemical Bonding and Molecular Structure. Asked once: 4 Apr 2024 (same type asked 9 times) See all 9 of this type

    60
    Number of molecules/species from the following having one unpaired electron is _________ .
    O2,O2−1,NO,CN−1,O22−O_{2},O_{2}^{- 1},NO,CN^{- 1},O_{2}^{2 -}

  2. Question 2

    Chemical Bonding and Molecular Structure. Asked once: 14 Jun 2022 (same type asked 9 times) See all 9 of this type

    123
    The correct order of bond orders of C22−,N22−C_{2}^{2 -},N_{2}^{2 -} and O22−O_{2}^{2 -} is, respectively.

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  3. Question 3

    Some Basic Concepts of Chemistry. Asked once: 2021 Paper 26 (same type asked 9 times) See all 9 of this type

    51
    The NaNO3NaNO_{3} weighed out to make 50 mL50\text{ }mL of an aqueous solution containing 70.0 mg Na+70.0\ mg\ Na^{+} per mLmL is ______ gg. (Rounded off to the nearest integer) [Given: Atomic weight in g mol−1g\ mol^{-1}. Na:23;N:14;O:16Na:23; N:14; O:16]

  4. Question 4

    Organic Chemistry - Some Basic Principles and Techniques. Asked once: 28 Jan 2025 (same type asked 8 times) See all 8 of this type

    119
    Given below are two statements : Statement (I): Methylcyclopentane and hex-3-ene are isomeric compounds. Statement (II): Pentan-1-amine and N-ethylpropan-1-amine are functional group isomers. In the light of the above statements, choose the correct answer from the options given below :

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  5. Question 5

    Structure of Atom. Asked once: 22 Jan 2026 S2 (same type asked 8 times) See all 8 of this type

    39
    The energy of first (lowest) Balmer line of H atom is x J . The energy (in J) of second Balmer line of H atom is :

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