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Day 340: JEE Mains Chemistry

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

  1. Question 1

    Chemical Thermodynamics. Asked once: 26 Jun 2022 (same type asked 5 times) See all 5 of this type

    51
    For complete combustion of methanol
    CH3OH(l)+32O2( g)→CO2( g)+2H2O(l)CH_{3}OH(l) +\frac{3}{2}O_{2}(\text{ }g) \rightarrow CO_{2}(\text{ }g) + 2H_{2}O(l)
    the amount of heat produced as measured by bomb calorimeter is 726 kJ mol−1726\text{ }kJ{\text{ }mol}^{- 1} at 27∘C27^{\circ}C. The enthalpy of combustion for the reaction is −xkJmol−1- xkJmol^{- 1}, where xx is ____\_\_\_\_. (Nearest integer) (Given: R=8.3JK−1 mol−1R = 8.3JK^{- 1}{\text{ }mol}^{- 1} )

  2. Question 2

    Classification of Elements and Periodicity. Asked once: 2021 Paper 14 (same type asked 5 times) See all 5 of this type

    33
    Decreasing order of ionic radii: Al3+;K+;Na+;Mg2+Al^{3 +};K^{+};Na^{+};Mg^{2 +}

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  3. Question 3

    Amines. Asked once: 2021 Paper 13 (same type asked 5 times) See all 5 of this type

    39
    Which compound does not give Friedel craft reaction?

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  4. Question 4

    Electrochemistry. Asked once: 2021 Paper 25 (same type asked 5 times) See all 5 of this type

    52
    Consider the following reaction MnO4−+8H++5e−→Mn+2+4H2O,E∘=1.51 VMnO_{4}^{-}+ 8H^{+}+ 5e^{-}\rightarrow Mn^{+ 2}+ 4H_{2}O,E^{\circ}= 1.51\text{ }V. The quantity of electricity required in Faraday to reduce five moles of MnO4−MnO_{4}^{-}is

  5. Question 5

    Some Basic Concepts of Chemistry. Asked once: 2021 Paper 23 (same type asked 5 times) See all 5 of this type

    34
    In which one of the following sets all species show disproportionation reaction?

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