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Day 351: JEE Mains Chemistry

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

  1. Question 1

    Solutions. Asked once: 6 Apr 2023 (same type asked 7 times) See all 7 of this type

    54
    Mass of Urea (NH2CONH2)\left( NH_{2}CONH_{2} \right) required to be dissolved in 1000 g1000\text{ }g of water to reduce the vapour pressure of water by 25%25\% is......g. (Nearest integer) Given: Molar mass of N, C, O and H are 14, 12, 16 and 1 g mol−11\text{ }g{\text{ }mol}^{- 1} respectively.

  2. Question 2

    Biomolecules. Asked once: 26 Jul 2022 (same type asked 7 times) See all 7 of this type

    49
    Which of the following is reducing sugar?

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  3. Question 3

    Chemical Kinetics. Asked once: 14 Jun 2022 (same type asked 7 times) See all 7 of this type

    125
    For a first order reaction, the time required for completion of 90%90\% reaction is ' xx ' times the half life of the reaction. The value of ' xx ' is (Given: ln⁡10=2.303\ln10 = 2.303 and log⁡2=0.3010\log2 = 0.3010 )

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  4. Question 4

    Amines. Asked once: 4 Apr 2024 (same type asked 7 times) See all 7 of this type

    144
    From 6.55 g6.55\text{ }g of aniline, the maximum amount of acetanilide that can be prepared will be _______ ×10−1 g\times10^{- 1}\text{ }g.

  5. Question 5

    Organic Chemistry - Some Basic Principles and Techniques. Asked once: 14 Jun 2022 (same type asked 7 times) See all 7 of this type

    148
    0.2 g0.2\text{ }g of an organic compound was subjected to estimation of nitrogen by Dumas method in which volume of N2N_{2} evolved (at STP) was found to be 22.400 mL22.400\text{ }mL. The percentage of nitrogen in the compound is [nearest integer] (Given: Molar mass of N2N_{2} is 28 g mol−128\text{ }g\text{ }mol^{-1}. Molar volume of N2N_{2} at STP: 22.4 L22.4\text{ }L)