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Day 142: JEE Mains Chemistry

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

  1. Question 1

    Amines. Asked once: 23 Jan 2026 S1 (same type asked 4 times) See all 4 of this type

    32
    Consider the following sequence of reactions. 4-Nitrotoluene Assuming that the reaction proceeds to completion, then 137 mg of 4-nitrotoluene will produce ____\_\_\_\_ mg of B . (Given molar mass in gmol−1H:1,C:12, N:14gmol^{- 1}H:1,C:12,\text{ }N:14, O :16, Br:80Br:80 )

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  2. Question 2

    Biomolecules. Asked once: 2 Apr 2026 S2 (same type asked 4 times) See all 4 of this type

    44
    Identify the correct pair having amino acid (A) and the hormone (B) that is iodinated derivative of the amino acid (A). (T and Y represent one-letter codes for amino acids.)

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  3. Question 3

    Classification of Elements and Periodicity. Asked once: 30 Jan 2023 (same type asked 4 times) See all 4 of this type

    34
    Match List I with List II
    LIST I (Atomic number)LIST II (Block of periodic table)
    A.37I.p-block
    B.78II.d-block
    C.52III.f-block
    D.65IV.s-block
    Choose the correct answer from the options given below:

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  4. Question 4

    Solutions. Asked once: 24 Jan 2026 S1 (same type asked 4 times) See all 4 of this type

    37
    ' W ' g of a non-volatile electrolyte solid solute of molar mass ' M ' gmol−1gmol^{- 1} when dissolved in 100 mL water, decreases vapour pressure of water from 640 mm Hg to 600 mm Hg . If aqueous solution of the electrolyte boils at 375 K and KbK_{b} for water is 0.52 K kg mol−10.52\text{ }K\text{ }kg{\text{ }mol}^{- 1}, then the mole fraction of the electrolyte solute (x2x_{2}) in the solution can be expressed as (Given : density of water =1 g/mL= 1\text{ }g/mL and boiling point of water =373 K= 373\text{ }K )

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  5. Question 5

    The p-Block Elements. Asked once: 24 Jan 2025 (same type asked 4 times) See all 4 of this type

    38
    The large difference between the melting and boiling points of oxygen and sulphur may be explained on the basis of

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