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Day 284: JEE Mains Chemistry

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

  1. Question 1

    Organic Chemistry - Some Basic Principles and Techniques. Asked once: 27 Jul 2022 (same type asked 7 times) See all 7 of this type

    139
    Match List-I with List-II.
    List-I (Mixture)List-II (Purification Process)
    (A) Chloroform and Aniline(I) Steam distillation
    (B) Benzoic acid and Naphthalene(II) Sublimation
    (C) Water and Aniline(III) Distillation
    (D) Naphthalene and Sodium chloride(IV) Crystallisation
    Choose the correct answer from the options given below:

    Tap an option to check your answer.

  2. Question 2

    Chemical Thermodynamics. Asked once: 25 Jul 2022 (same type asked 7 times) See all 7 of this type

    52
    The enthalpy of combustion of propane, graphite and dihydrogen at 298 K298\text{ }K are: −2220.0 kJ mol−1-2220.0\text{ }kJ{\text{ }mol}^{-1}, −393.5 kJ mol−1-393.5\text{ }kJ{\text{ }mol}^{-1} and −285.8 kJ mol−1-285.8\text{ }kJ{\text{ }mol}^{-1} respectively. The magnitude of enthalpy of formation of propane (C3H8)\left( C_{3}H_{8} \right) is ____ kJ mol−1kJ\ mol^{-1}. (Nearest integer)

  3. Question 3

    Biomolecules. Asked once: 30 Jan 2024 (same type asked 7 times) See all 7 of this type

    33
    Sugar which does not give reddish brown precipitate with Fehling's reagent is:

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  4. Question 4

    Chemical Kinetics. Asked once: 13 Apr 2023 (same type asked 7 times) See all 7 of this type

    58
    t87.5t_{87.5} is the time required for the reaction to undergo 87.5%87.5\% completion and t50t_{50} is the time required for the reaction to undergo 50%50\% completion. The relation between t87.5t_{87.5} and t50t_{50} for a first order reaction is t87.5=x×t50t_{87.5}= x \times t_{50} The value of xx is _________(Nearest integer)

  5. Question 5

    Amines. Asked once: 6 Apr 2024 (same type asked 7 times) See all 7 of this type

    55
    9.3 g9.3\text{ }g of pure aniline upon diazotisation followed by coupling with phenol gives an orange dye. The mass of orange dye produced (assume 100% yield/ conversion) is _____ g. (nearest integer)