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Day 13: JEE Mains Chemistry

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

  1. Question 1

    Biomolecules. This type asked 6 times: 2021 Paper 1, 2021 Paper 6, 28 Jun 2022, 10 Apr 2023, 23 Jan 2025, 5 Apr 2026 S2. This one: 5 Apr 2026 S2 See all 6 of this type

    43
    Identify the incorrect statement about tertiary structure of proteins.

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  2. Question 2

    Some Basic Concepts of Chemistry. This type asked 6 times: 31 Jan 2023, 11 Apr 2023, 3 Apr 2025, 21 Jan 2026 S1, 22 Jan 2026 S1, 5 Apr 2026 S2. This one: 5 Apr 2026 S2 See all 6 of this type

    26
    What volume of hydrogen gas at STP would be liberated by action of 50 mL of H2SO4H_{2}SO_{4} of 50%50\% purity (density =1.3 g mL−1= 1.3\text{ }g{\text{ }mL}^{- 1} ) on 20 g of zinc? Given : Molar mass of H, O, S, Zn are 1, 16, 32, 65 gmol−1gmol^{- 1} respectively.

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  3. Question 3

    The p-Block Elements. This type asked 6 times: 14 Jun 2022, 8 Apr 2024, 22 Jan 2025, 4 Apr 2025, 22 Jan 2026 S1, 5 Apr 2026 S1. This one: 5 Apr 2026 S1 See all 6 of this type

    34
    Correct statements from the following are : (A) Nitrogen in oxidation states from +1 to +4 disproportionate in acid medium. (B) Nitrogen has the ability of form dπ−pπd\pi - p\pi multiple bonds with itself and other elements with small size and high electronegativity. (C) N-N single bond is stronger than P-P single bond. (D) Nitrogen has highest density in its group due to small size. (E) The maximum covalency of nitrogen is four since it has only four valence orbitals for bonding. Choose the correct answer from the options given below :

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  4. Question 4

    Equilibrium. This type asked 6 times: 26 Jun 2022, 25 Jan 2023, 13 Apr 2023, 7 Apr 2025, 4 Apr 2026 S1, 4 Apr 2026 S2. This one: 4 Apr 2026 S2 See all 6 of this type

    30
    20 mL of a solution of acetic acid required 28.4 mL of 0.1 M NaOH for its neutralization. A solution (X) was prepared by mixing 20 mL of the above acetic acid and 14.2 mL of 0.1 M NaOH solution. What is the pH of the solution (X) ? (pKa\left( pK_{a} \right. value of acetic acid is 4.75).

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  5. Question 5

    Hydrocarbons. This type asked 6 times: 29 Jan 2023, 31 Jan 2023, 8 Apr 2023, 23 Jan 2025, 3 Apr 2025, 4 Apr 2026 S1. This one: 4 Apr 2026 S1 See all 6 of this type

    39
    An alkene (X) on ozonolytic followed by reduction gives following products. The alkene ( X ) is :

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