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Day 87: JEE Mains Chemistry

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

  1. Question 1

    Chemical Thermodynamics. This type asked 2 times: 2021 Paper 15, 2 Apr 2026 S2. This one: 2 Apr 2026 S2 See all 2 of this type

    29
    Gas 'A' undergoes change from state ' X ' to state ' Y '. In this process, the heat absorbed, and work done by the gas is 10 J and 18 J respectively. Now gas is brought back to state ' X ' by another process during which 6 J of heat is evolved. In the reverse process of ' Y ' to ' X ',

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  2. Question 2

    Electrochemistry. This type asked 2 times: 3 Apr 2025, 2 Apr 2026 S2. This one: 2 Apr 2026 S2 See all 2 of this type

    48
    Consider the following two half-cell reactions along with the standard reduction potential given :
    CO2+6H++6e−→CH3OH+H2OEred o=0.02 V{CO}_{2} + 6H^{+} + 6e^{-} \rightarrow {CH}_{3}OH + H_{2}OE_{\text{red~}}^{o} = 0.02\text{ }V
    12O2+2H++2e−→H2OEred o=1.23 V\frac{1}{2}O_{2} + 2H^{+} + 2e^{-} \rightarrow H_{2}OE_{\text{red~}}^{o} = 1.23\text{ }V
    The fuel cell was set up using the above two reactions such that the cell operates under the standard condition of 1 bar pressure and 298 K temperature. The fuel cell works with 80%80\% efficiency. If the work derived from the cell using 1 mol of CH3OH{CH}_{3}OH is used to compress an ideal gas isothermally against a constant pressure of 1 kPa , then the change in the volume of the gas, ΔV=\Delta V = ____\_\_\_\_ m3m^{3}. (Nearest integer) Given : F=96500Cmol−1F = 96500C{mol}^{- 1}

  3. Question 3

    Equilibrium. This type asked 2 times: 21 Jan 2026 S2, 2 Apr 2026 S2. This one: 2 Apr 2026 S2 See all 2 of this type

    27
    The first and second ionization constants of a weak dibasic acid H2 AH_{2}\text{ }A are 8.1×10−88.1 \times10^{- 8} and 1.0×10−131.0 \times10^{- 13} respectively. 0.1 mol of H2 AH_{2}\text{ }A was dissolved in 1L of 0.1 M HCl solution. The concentration of HA−HA^{-} in the resultant solution is :

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  4. Question 4

    Coordination Compounds. This type asked 2 times: 24 Jan 2026 S2, 2 Apr 2026 S1. This one: 2 Apr 2026 S1 See all 2 of this type

    46
    5.33 g of CrCl3⋅6H2O{CrCl}_{3} \cdot 6H_{2}O, which is a 1:31:3 electrolyte, is dissolved in water and is passed through a cation exchanger. The chloride ions in the eluted solution, on treatment with AgNO3{AgNO}_{3}, results in 8.61 g of AgCl . The ratio of moles of complex reacted and moles of AgCl formed is ____\_\_\_\_ ×10−2\times 10^{- 2}. (Nearest integer) [Molar mass in gmol−1Cr:52,Ag:108,Cl:35.5g{mol}^{- 1}Cr:52,Ag:108,Cl:35.5, H:1,O:16]H:1,O:16\rbrack

  5. Question 5

    Organic Chemistry - Some Basic Principles and Techniques. This type asked 2 times: 26 Jul 2022, 2 Apr 2026 S1. This one: 2 Apr 2026 S1 See all 2 of this type

    40
    In IUPAC nomenclature, the correct order of decreasing priority of functional group is :

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