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Day 298: JEE Mains Chemistry

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

  1. Question 1

    Chemical Thermodynamics. Asked once: 2021 Paper 25 (same type asked 5 times) See all 5 of this type

    56
    For a chemical reaction A+B⇌C+DA + B \rightleftharpoons C + D (ΔrH⊖=80 kJ mol−1\left( \Delta_{r}H^{\ominus}= 80\text{ }kJ{\text{ }mol}^{- 1} \right. ) the entropy change ΔrS⊖\Delta_{r}S^{\ominus} depends on the temperature TT (in KK ) as ΔrS⊖=2 T( J K−1 mol−1)\Delta_{r}S^{\ominus}= 2\text{ }T\left( \text{ }J{\text{ }K}^{- 1}{\text{ }mol}^{- 1} \right). Minimum temperature at which it will become spontaneous is ____\_\_\_\_ K.

  2. Question 2

    Coordination Compounds. Asked once: 29 Jun 2022 (same type asked 5 times) See all 5 of this type

    147
    For the reaction given below:
    CoCl3⋅xNH3+AgNO3(aq)→CoCl_{3}\cdot xNH_{3}+AgNO_{3}(aq) \rightarrow
    If two equivalents of AgClAgCl precipitate out, then the value of xx will be

  3. Question 3

    The d- and f-Block Elements. Asked once: 27 Jun 2022 (same type asked 5 times) See all 5 of this type

    129
    The ' ff ' orbitals are half and completely filled, respectively in lanthanide ions (Given: Atomic no. Eu,63;Sm,62;Tm,69;TbEu,63;Sm,62;Tm,69;Tb, 65; Yb, 70; Dy, 66]

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  4. Question 4

    Organic Chemistry - Some Basic Principles and Techniques. Asked once: 29 Jan 2023 (same type asked 5 times) See all 5 of this type

    58
    Following chromatogram was developed by adsorption of compound 'A' on a 6 cm6\text{ }cm TLC glass plate. Retardation factor of the compound ' AA ' is ×10−1\times10^{- 1}

  5. Question 5

    Amines. Asked once: 2021 Paper 25 (same type asked 5 times) See all 5 of this type

    36
    An amine on reaction with benzene sulphonyl chloride produces a compound insoluble in alkaline solution. This amine can be prepared by ammonolysis of ethyl chloride. The correct structure of amine is:

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