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Day 299: JEE Mains Chemistry

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

  1. Question 1

    Solutions. Asked once: 1 Feb 2023 (same type asked 5 times) See all 5 of this type

    55
    25 mL25\text{ }mL of an aqueous solution of KClKCl was found to require 20 mL20\text{ }mL of 1MAgNO31MAgNO_{3} solution when titrated using K2CrO4K_{2}CrO_{4} as an indicator. What is the depression in freezing point of KClKCl solutions of the given concentration? ____ (Nearest integer). (Given: Kf=2.0 K kg mol−1K_{f}= 2.0\text{ }K\text{ }kg{\text{ }mol}^{- 1} ) Assume 1) 100%100\% ionization and 2) density of the aqueous solution as 1 g mL−11\text{ }g{\text{ }mL}^{- 1}

  2. Question 2

    Chemical Bonding and Molecular Structure. Asked once: 27 Jan 2024 (same type asked 5 times) See all 5 of this type

    142
    The number of non-polar molecules from the following is _____
    HF,H2O,SO2,H2,CO2,CH4,NH3,HCl,CHCl3,BF3HF,H_{2}O,SO_{2},H_{2},CO_{2},CH_{4},NH_{3},HCl,CHCl_{3},BF_{3}

  3. Question 3

    Chemical Thermodynamics. Asked once: 28 Jun 2022 (same type asked 5 times) See all 5 of this type

    142
    For combustion of one mole of magnesium in an open container at 300 K300\text{ }K and 1 bar pressure, ΔCH⊖\Delta_{C}H^{\ominus} =−601.70 kJ mol−1= - 601.70\text{ }kJ{\text{ }mol}^{- 1}, the magnitude of change in internal energy for the reaction is ____\_\_\_\_ kJkJ. (Nearest integer) (Given: R=8.3 J K−1 mol−1R = 8.3\text{ }J{\text{ }K}^{- 1}{\text{ }mol}^{- 1} )

  4. Question 4

    Classification of Elements and Periodicity. Asked once: 2021 Paper 21 (same type asked 5 times) See all 5 of this type

    39
    The correct order of ionic radii for the ions, P3−,S2−P^{3 -},S^{2 -}, Ca2+,K+,Cl−Ca^{2 +},K^{+},Cl^{-}is:

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  5. Question 5

    Amines. Asked once: 29 Jun 2022 (same type asked 5 times) See all 5 of this type

    136
    In Friedel-Crafts alkylation of aniline, one gets:

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