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Day 326: JEE Mains Chemistry

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

  1. Question 1

    Biomolecules. Asked once: 11 Apr 2023 (same type asked 7 times) See all 7 of this type

    141
    Number of compounds from the following which will not produce orange red precipitate with Benedict solution is Glucose, maltose, sucrose, ribose, 2-deoxyribose, amylose, lactose.

  2. Question 2

    Chemical Kinetics. Asked once: 28 Jun 2022 (same type asked 7 times) See all 7 of this type

    58
    For a first order reaction A→BA \rightarrow B, the rate constant, k=5.5×10−14 s−1k = 5.5 \times10^{- 14}{\text{ }s}^{- 1}. The time required for 67%67\% completion of reaction is x×10−1x \times10^{- 1} times the half life of reaction. The value of xx is (Nearest integer) (Given: log⁡3=0.4771\log3 = 0.4771 )

  3. Question 3

    Amines. Asked once: 5 Apr 2024 (same type asked 7 times) See all 7 of this type

    60
    9.3 g9.3\text{ }g of pure aniline is treated with bromine water at room temperature to give a white precipitate of the product ' PP '. The mass of product ' PP ' obtained is 26.4 g26.4\text{ }g. The percentage yield is............ %\%.

  4. Question 4

    Organic Chemistry - Some Basic Principles and Techniques. Asked once: 28 Jul 2022 (same type asked 7 times) See all 7 of this type

    146
    A sample of 0.125 g0.125\text{ }g of an organic compound when analysed by Dumas' method yields 22.78 mL22.78\text{ }mL of nitrogen gas collected over KOHKOH solution at 280 K280\text{ }K and 759 mmHg759\text{ }mmHg. The percentage of nitrogen in the given organic compound is _____ (Nearest integer). (a) The vapour pressure of water at 280 K280\text{ }K is 14.2 mmHgmmHg (b) R=0.082 L atm K−1 mol−1R = 0.082\text{ }L\text{ }atm{\text{ }K}^{- 1}{\text{ }mol}^{- 1}

  5. Question 5

    Hydrocarbons. Asked once: 15 Apr 2023 (same type asked 7 times) See all 7 of this type

    39
    Decreasing order of reactivity towards electrophilic substitution for the following compounds is: (A) (B) (C) (D) (E)

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