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Day 148: JEE Mains Chemistry

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

  1. Question 1

    Chemical Thermodynamics. Asked once: 1 Feb 2023 (same type asked 4 times) See all 4 of this type

    141
     0.3 g\ 0.3\text{ }g of ethane undergoes combustion at 27∘C27^{\circ}C in a bomb calorimeter. The temperature of calorimeter system (including the water) is found to rise by 0.5∘C0.5^{\circ}C. The heat evolved during combustion of ethane at constant pressure is ____\_\_\_\_ kJmol−1kJmol^{- 1}. (Nearest integer) [Given: The heat capacity of the calorimeter system is 20 kJ K−1,R=8.3JK−1 mol−120\text{ }kJ{\text{ }K}^{- 1},R = 8.3JK^{- 1}{\text{ }mol}^{- 1}. Assume ideal gas behaviour. Atomic mass of CC and HH are 12 and 1 g mol−11\text{ }g{\text{ }mol}^{- 1} respectively]

  2. Question 2

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

    141
    Number of complexes which show optical isomerism among the following is________ cis −[Cr(ox)2Cl2]3−,[Co(en)3]3+-\left\lbrack Cr(ox)_{2}Cl_{2} \right\rbrack^{3 -},\left\lbrack Co(en)_{3} \right\rbrack^{3 +}, cis −[Pt( en )2Cl2]2+-\left\lbrack Pt(\text{~en~})_{2}Cl_{2} \right\rbrack^{2 +}, cis −[Co(en)2Cl2]+-\left\lbrack Co(en)_{2}Cl_{2} \right\rbrack^{+}, trans −[Pt(en)2Cl2]2+-\left\lbrack Pt(en)_{2}Cl_{2} \right\rbrack^{2 +}, trans −[Cr(ox)2Cl2]3−-\left\lbrack Cr(ox)_{2}Cl_{2} \right\rbrack^{3 -}

  3. Question 3

    Organic Chemistry - Some Basic Principles and Techniques. Asked once: 29 Jan 2024 (same type asked 4 times) See all 4 of this type

    121
    The ascending acidity order of the following HH atoms is

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  4. Question 4

    Solutions. Asked once: 28 Jul 2022 (same type asked 4 times) See all 4 of this type

    54
    150 g150\text{ }g of acetic acid was contaminated with 10.2 g10.2\text{ }g ascorbic acid (C6H8O6)\left( C_{6}H_{8}O_{6} \right) to lower down its freezing point by (x×10−1)∘C\left( x \times10^{- 1} \right)^{\circ}C. The value of xx is (Nearest integer) [Given Kf=3.9 K kg mol−1K_{f}= 3.9\text{ }K\text{ }kg{\text{ }mol}^{- 1}; Molar mass of ascorbic acid =176 g mol−1= 176\text{ }g{\text{ }mol}^{- 1} ]

  5. Question 5

    The d- and f-Block Elements. Asked once: 2 Apr 2025 (same type asked 4 times) See all 4 of this type

    125
    The spin-only magnetic moment value of Mn+M^{n +} ion formed by the metal among Ni,Zn,MnNi, Zn, Mn and Cu that has the least enthalpy of atomisation is ____ . (in nearest integer) Here n is equal to the number of diamagnetic complexes among K2[NiCl4]K_{2}\left\lbrack {NiCl}_{4} \right\rbrack, [Zn(H2O)6]Cl2\left\lbrack Zn\left( H_{2}O \right)_{6} \right\rbrack{Cl}_{2}, K3[Mn(CN)6]K_{3}\left\lbrack Mn(CN)_{6} \right\rbrack and [Cu(PPh3)3I]\left\lbrack Cu\left( {PPh}_{3} \right)_{3}I \right\rbrack