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Day 523: JEE Mains Chemistry

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

  1. Question 1

    Chemical Thermodynamics. Asked once: 30 Jan 2023

    142
    1 mole of ideal gas is allowed to expand reversibly and adiabatically from a temperature of 27∘C27^{\circ}C. The work done is 3 kJ mol−13\text{ }kJ{\text{ }mol}^{- 1}. The final temperature of the gas is_____ KK (Nearest integer). Given CV=C_{V}= 20 J mol−1 K−120\text{ }J{\text{ }mol}^{- 1}{\text{ }K}^{- 1}

  2. Question 2

    Classification of Elements and Periodicity. Asked once: 28 Jul 2022

    35
    In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical? (a) RbRb and CsCs (b) NaNa and KK (c) Ar and KrKr (d) I and At Choose the correct answer from the options given below:

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  3. Question 3

    Haloalkanes and Haloarenes. Asked once: 29 Jul 2022

    134
    Compound 'A' undergoes following sequence of reactions to give compound ' BB '. The correct structure and chirality of compound ' BB ' is: [where Et is −C2H5-C_{2}H_{5} ] Compound 'A'

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  4. Question 4

    Hydrocarbons. Asked once: 5 Apr 2024

    148
    The product (C) in the following sequence of reactions has ____ π\pi bonds.

  5. Question 5

    Organic Chemistry - Some Basic Principles and Techniques. Asked once: 29 Jan 2024

    57
    Number of compounds among the following which contain sulphur as heteroatom is ____ . Furan, Thiophene, Pyridine, Pyrrole, Cysteine, Tyrosine