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Day 63: JEE Mains Chemistry

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

  1. Question 1

    Structure of Atom. This type asked 3 times: 30 Jan 2024, 24 Jan 2025, 28 Jan 2025. This one: 28 Jan 2025 See all 3 of this type

    116
    Which of the following is/are not correct with respect to energy of atomic orbitals of hydrogen atom? (A) 1 s <2< 2 p <3< 3 d <4< 4 s (B) 1 s<2 s=2p<3 s=3p1\text{ }s < 2\text{ }s = 2p < 3\text{ }s = 3p (C) 1 s<2 s<2p<3 s<3p1\text{ }s < 2\text{ }s < 2p < 3\text{ }s < 3p (D) 1 s<2 s<4 s<3 d1\text{ }s < 2\text{ }s < 4\text{ }s < 3\text{ }d Choose the correct answer from the options given below :

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  2. Question 2

    The d- and f-Block Elements. This type asked 3 times: 26 Jul 2022, 6 Apr 2024, 28 Jan 2025. This one: 28 Jan 2025 See all 3 of this type

    121
    The spin only magnetic moment ( μ\mu ) value (B.M.) of the compound with strongest oxidising power among Mn2O3,TiOMn_{2}O_{3},TiO and VO is ____\_\_\_\_ B.M. (Nearest integer).

  3. Question 3

    Biomolecules. This type asked 3 times: 2021 Paper 20, 6 Apr 2024, 24 Jan 2025. This one: 24 Jan 2025 See all 3 of this type

    119
    Match List-I with List-II. List-I List-II (A) Adenine (I) (B) Cytosine (II) (C) Thymine (III) (D) Uracil (IV) Choose the correct answer from the options given below :

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  4. Question 4

    Chemical Kinetics. This type asked 3 times: 29 Jan 2024, 4 Apr 2024, 24 Jan 2025. This one: 24 Jan 2025 See all 3 of this type

    123
    Consider a complex reaction taking place in three steps with rate constants k1,k2k_{1},k_{2} and k3k_{3} respectively. The overall rate constant kk is given by the expression k=k1k3k2k =\sqrt{\frac{k_{1}k_{3}}{k_{2}}}. If the activation energies of the three steps are 60,30 and 10 kJ mol−110\text{ }kJ{\text{ }mol}^{- 1} respectively, then the overall energy of activation in kJmol−1kJmol^{- 1} is ______\_\_\_\_\_\_ . (Nearest integer)

  5. Question 5

    Hydrocarbons. This type asked 3 times: 27 Jan 2024, 1 Feb 2024, 24 Jan 2025. This one: 24 Jan 2025 See all 3 of this type

    114
    Identify correct statement/s : (A) −OCH3-OCH_{3} and −NHCOCH3-NHCOCH_{3} are activating group (B) -CN and -OH are meta directing group (C) -CN and −SO3H-SO_{3}H are meta directing group (D) Activating groups act as ortho - and para directing groups (E) Halides are activating groups Choose the correct answer from the options given below :

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