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Day 235: JEE Mains Chemistry

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

  1. Question 1

    Amines. Asked once: 25 Jun 2022 (same type asked 4 times) See all 4 of this type

    48
    The reaction of R−CO−NH2R-CO-NH_{2} with bromine and KOHKOH gives RNH2RNH_{2} as the end product. Which one of the following is the intermediate product formed in this reaction?

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  2. Question 2

    Chemical Thermodynamics. Asked once: 30 Jan 2024 (same type asked 4 times) See all 4 of this type

    143
    Two reactions are given below:
    2Fe(s)+32O2( g)→Fe2O3( s),ΔHo=−822 kJ/molC(s)+12O2( g)→CO(g),ΔHo=−110 kJ/mol\begin{matrix} & 2Fe_{(s)}+\frac{3}{2}O_{2(\text{ }g)}\rightarrow Fe_{2}O_{3(\text{ }s)},\Delta H^{o}= - 822\text{ }kJ/mol \\ & C_{(s)}+\frac{1}{2}O_{2(\text{ }g)}\rightarrow CO_{(g)},\Delta H^{o}= - 110\text{ }kJ/mol \end{matrix}
    Then enthalpy change for following reaction 3C(s)+Fe2O3( s)→2Fe(s)+3CO(g)3C_{(s)}+Fe_{2}O_{3(\text{ }s)}\rightarrow 2Fe_{(s)}+ 3CO_{(g)}

  3. Question 3

    Classification of Elements and Periodicity. Asked once: 29 Jul 2022 (same type asked 4 times) See all 4 of this type

    34
    The first ionization enthalpy of Na,MgNa,Mg and SiSi, respectively, are: 496,737 and 786 kJ mol−1786\text{ }kJ{\text{ }mol}^{- 1}. The first ionization enthalpy (kJmol−1)\left( kJmol^{- 1} \right) of AlAl is:

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  4. Question 4

    Solutions. Asked once: 31 Jan 2024 (same type asked 4 times) See all 4 of this type

    33
    Identify the mixture that shows positive deviations from Raoult's Law

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  5. Question 5

    Some Basic Concepts of Chemistry. Asked once: 28 Jun 2022 (same type asked 4 times) See all 4 of this type

    51
    A 2.0 g2.0\text{ }g sample containing MnO2MnO_{2} is treated with HClHCl liberating Cl2Cl_{2}. The Cl2Cl_{2} gas is passed into a solution of KIKI and 60.0 mL60.0\text{ }mL of 0.1MNa2 S2O30.1MNa_{2}{\text{ }S}_{2}O_{3} is required to titrate the liberated iodine. The percentage of MnO2MnO_{2} in the sample is (Nearest integer) [Atomic masses (in u) Mn=55;Cl=35.5;O=16Mn = 55;Cl = 35.5;O = 16, I=127,Na=23, K=39, S=32]I = 127,Na = 23,\text{ }K = 39,\text{ }S = 32\rbrack