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Day 60: JEE Mains Chemistry

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

  1. Question 1

    Biomolecules. This type asked 3 times: 4 Apr 2024, 22 Jan 2025, 3 Apr 2025. This one: 3 Apr 2025 See all 3 of this type

    31
    Which of the following is the correct structure of L-fructose ?

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  2. Question 2

    Chemical Thermodynamics. This type asked 3 times: 13 Apr 2023, 4 Apr 2024, 3 Apr 2025. This one: 3 Apr 2025 See all 3 of this type

    49
    Given :
    ΔHsub⊖[C( graphite )]=710 kJ mol−1ΔC−HH⊖=414 kJ mol−1ΔH−HH⊖=436 kJ mol−1ΔC=CH⊖=611 kJ mol−1\begin{matrix} & \Delta H_{sub}^{\ominus}\lbrack C(\text{~graphite~})\rbrack = 710\text{ }kJ{\text{ }mol}^{- 1} \\ & \Delta_{C - H}H^{\ominus} = 414\text{ }kJ{\text{ }mol}^{- 1} \\ & \Delta_{H - H}H^{\ominus} = 436\text{ }kJ{\text{ }mol}^{- 1} \\ & \Delta_{C = C}H^{\ominus} = 611\text{ }kJ{\text{ }mol}^{- 1} \end{matrix}
    The ΔHf⊖\Delta H_{f}^{\ominus} for CH2=CH2{CH}_{2} = {CH}_{2} is ____ kJmol−1kJ{mol}^{- 1} (nearest integer value)

  3. Question 3

    Organic Chemistry - Some Basic Principles and Techniques. This type asked 3 times: 2021 Paper 13, 4 Apr 2024, 3 Apr 2025. This one: 3 Apr 2025 See all 3 of this type

    125
    The total number of structural isomers possible for the substituted benzene derivatives with the molecular formula C9H12C_{9}H_{12} is ____ .

  4. Question 4

    The d- and f-Block Elements. This type asked 3 times: 2021 Paper 22, 29 Jun 2022, 3 Apr 2025. This one: 3 Apr 2025 See all 3 of this type

    50
    Consider the following reactions A+NaCl+H2SO4→CrO2Cl2+A + NaCl + H_{2}{SO}_{4} \rightarrow {CrO}_{2}{Cl}_{2} + side products
    CrO2Cl2( Vapour )+NaOH→B+NaCl+H2OB+H+→C+H2O\begin{gathered}{CrO}_{2}{Cl}_{2(\text{~Vapour~})} + NaOH \rightarrow B + NaCl + H_{2}O \\ B + H^{+} \rightarrow C + H_{2}O\end{gathered}
    The number of terminal ' OO ' present in the compound ' CC ' is____ .

  5. Question 5

    Classification of Elements and Periodicity. This type asked 3 times: 8 Apr 2023, 22 Jan 2025, 2 Apr 2025. This one: 2 Apr 2025 See all 3 of this type

    110
    Electronic configuration of four elements A,B,CA,B,C and D are given below (A) 1 s22 s22p31{\text{ }s}^{2}2{\text{ }s}^{2}2p^{3} (B) 1 s22 s22p41{\text{ }s}^{2}2{\text{ }s}^{2}2p^{4} (C) 1 s22 s22p51{\text{ }s}^{2}2{\text{ }s}^{2}2p^{5} (D) 1 s22 s22p21{\text{ }s}^{2}2{\text{ }s}^{2}2p^{2} Which of the following is the correct order of increasing electronegativity (Pauling's scale) ?

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