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Day 167: JEE Mains Chemistry

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

  1. Question 1

    Aldehydes, Ketones and Carboxylic Acids. Asked once: 26 Jul 2022 (same type asked 3 times) See all 3 of this type

    45
    Which reactant will give the following alcohol on reaction with one mole of phenyl magnesium bromide (PhMgBr)(PhMgBr) followed by acidic hydrolysis?

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  2. Question 2

    Chemical Kinetics. Asked once: 15 Apr 2023 (same type asked 3 times) See all 3 of this type

    58
    For a reversible reaction A⇌BA \rightleftharpoons B, the ΔHforward \Delta H_{\text{forward~}} reaction =20 kJ mol−1= 20\text{ }kJ{\text{ }mol}^{- 1}. The activation energy of the uncatalysed forward reaction is 300 kJ mol−1300\text{ }kJ{\text{ }mol}^{- 1}. When the reaction is catalysed keeping the reactant concentration same, the rate of the catalysed forward reaction at 27∘C27^{\circ}C is found to be same as that of the uncatalysed reaction at 327∘C327^{\circ}C. The activation energy of the catalysed backward reaction is___ kJmol−1kJmol^{- 1}.

  3. Question 3

    Some Basic Concepts of Chemistry. Asked once: 4 Apr 2025 (same type asked 3 times) See all 3 of this type

    121
    Sea water, which can be considered as a 6 molar (6M)(6M) solution of NaCl , has a density of 2 g mL−12\text{ }g{\text{ }mL}^{- 1}. The concentration of dissolved oxygen ( O2O_{2} ) in sea water is 5.8 ppm . Then the concentration of dissolved oxygen (O2)\left( O_{2} \right) in sea water, is x×10−4 mx \times 10^{- 4}\text{ }m. x=x = (Nearest integer) Given: Molar mass of NaCl is 58.5 g mol−158.5\text{ }g{\text{ }mol}^{- 1} Molar mass of O2O_{2} is 32 g mol−132\text{ }g{\text{ }mol}^{- 1}

  4. Question 4

    Structure of Atom. Asked once: 24 Jan 2023 (same type asked 3 times) See all 3 of this type

    129
    The number of s-electrons present in an ion with 55 protons in its unipositive state is

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  5. Question 5

    Biomolecules. Asked once: 22 Jan 2025 (same type asked 3 times) See all 3 of this type

    102
    Identify the number of structure/s from the following which can be correlated to D-glyceraldehyde.

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