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Day 9: JEE Mains Chemistry

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

  1. Question 1

    Organic Chemistry - Some Basic Principles and Techniques. This type asked 7 times: 27 Jul 2022, 30 Jan 2023, 31 Jan 2023, 31 Jan 2024, 2 Apr 2025, 4 Apr 2025, 5 Apr 2026 S2. This one: 5 Apr 2026 S2 See all 7 of this type

    37
    Match List-I with List-II.
    List-I (Purification technique)List-II (Used to separate)
    (A)Simple distillation(I)Steam volatile compound
    (B)Fractional distillation(II)Two liquids with large difference in boiling points
    (C)Steam distillation(III)Liquid decomposing at its boiling point
    (D)Distillation under reduced pressure(IV)Two liquids with close boiling points
    Choose the correct answer from the options given below :

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  2. Question 2

    Chemical Thermodynamics. This type asked 7 times: 14 Jun 2022, 25 Jun 2022, 25 Jul 2022, 6 Apr 2023, 22 Jan 2025, 28 Jan 2025, 4 Apr 2026 S2. This one: 4 Apr 2026 S2 See all 7 of this type

    46
    If 3.365 g of ethanol ( ll ) burnt completely in a bomb calorimeter at 298.15 K , the heat produced is 99.472 kJ . The ∣ΔHf ∘∣\left| \Delta H_{f}\ ^{\circ} \right| of ethanol at 298.15 K is ____\_\_\_\_ kJ mol−1kJ{\text{ }mol}^{- 1}. (Nearest integer) Given : Standard enthalpy of combustion of graphite =−393.5 kJ mol−1= - 393.5\text{ }kJ{\text{ }mol}^{- 1} Standard enthalpy of formation of water ( ll )=−285.8 kJ mol−1= - 285.8\text{ }kJ{\text{ }mol}^{- 1}. Molar mass in gmol−1{gmol}^{- 1} of C,H,OC,H,O are 12,1 and 16 respectively.

  3. Question 3

    Biomolecules. This type asked 7 times: 2021 Paper 9, 26 Jul 2022, 11 Apr 2023, 30 Jan 2024, 23 Jan 2026 S1, 28 Jan 2026 S2, 4 Apr 2026 S1. This one: 4 Apr 2026 S1 See all 7 of this type

    43
    Statement-I : The structure of maltose is given below, with the caption "Maltose is a non reducing sugar". Statement-II : The structure of lactose is given below, with the caption "Lactose is a reducing sugar". In the light of the above statements, choose the correct answer from the options given below

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  4. Question 4

    Chemical Kinetics. This type asked 7 times: 2021 Paper 22, 14 Jun 2022, 28 Jun 2022, 13 Apr 2023, 27 Jan 2024, 6 Apr 2024, 28 Jan 2026 S1. This one: 28 Jan 2026 S1 See all 7 of this type

    32
    An organic compound undergoes first order decomposition. The time taken for decomposition to (18)th \left( \frac{1}{8} \right)^{\text{th~}} and (110)th \left( \frac{1}{10} \right)^{\text{th~}} of its initial concentration are t1/8t_{1/8} and t1/10t_{1/10} respectively. What is the value of t1/8t1/10×10\frac{t_{1/8}}{t_{1/10}}\times 10 ?
    (log⁡2=0.3)(\log2 = 0.3)

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  5. Question 5

    Amines. This type asked 7 times: 27 Jan 2024, 4 Apr 2024, 5 Apr 2024, 6 Apr 2024, 8 Apr 2024, 22 Jan 2026 S2, 24 Jan 2026 S2. This one: 24 Jan 2026 S2 See all 7 of this type

    34
    A student has planned to prepare acetanilide from aniline using acetic anhydride. The student has started from 9.3 g of aniline. However, the student has managed to obtain 11 g of dry acetanilide. The % yield of this reaction is :-

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