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Day 134: JEE Mains Chemistry

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

  1. Question 1

    Chemical Thermodynamics. Asked once: 6 Apr 2024 (same type asked 5 times) See all 5 of this type

    146
    For the reaction at 298 K,2 A+B→298\text{ }K,2\text{ }A + B \rightarrow C. ΔH\Delta H =400 kJ mol−1= 400\text{ }kJ{\text{ }mol}^{- 1} and ΔS=0.2 kJ mol−1 K−1\Delta S = 0.2\text{ }kJ{\text{ }mol}^{- 1}{\text{ }K}^{- 1}. The reaction will become spontaneous above ____ KK.

  2. Question 2

    Coordination Compounds. Asked once: 23 Jan 2025 (same type asked 5 times) See all 5 of this type

    29
    CrCl3⋅xNH3CrCl_{3} \cdot xNH_{3} can exist as a complex. 0.1 molal aqueous solution of this complex shows a depression in freezing point of 0.558∘C0.558^{\circ}C. Assuming 100%100\% ionisation of this complex and coordination number of Cr is 6 , the complex will be (Given Kf=1.86 K kg mol−1K_{f}= 1.86\text{ }K\text{ }kg{\text{ }mol}^{- 1} )

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  3. Question 3

    The d- and f-Block Elements. Asked once: 31 Jan 2023 (same type asked 5 times) See all 5 of this type

    39
    Nd2+=Nd^{2 +}=

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  4. Question 4

    Organic Chemistry - Some Basic Principles and Techniques. Asked once: 5 Apr 2024 (same type asked 5 times) See all 5 of this type

    145
    Using the given figure, the ratio of RfR_{f} values of sample A and sample CC is x×10−2x \times10^{- 2}. Value of xx is_____ .

  5. Question 5

    Amines. Asked once: 10 Apr 2023 (same type asked 5 times) See all 5 of this type

    36
    Isomeric amines with molecular formula C8H11 NC_{8}H_{11}\text{ }N give the following tests Isomer (P) ⇒\Rightarrow Can be prepared by Gabriel phthalimide synthesis Isomer (Q)⇒(Q) \Rightarrow Reacts with Hinsberg's reagent to give solid insoluble in NaOHNaOH Isomer (R)⇒(R) \Rightarrow Reacts with HONO followed by β\beta-naphthol in NaOHNaOH to give red dye. Isomers (P), (Q) and (R) respectively are

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