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Day 396: JEE Mains Chemistry

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

  1. Question 1

    Chemical Thermodynamics. Asked once: 2 Apr 2026 S1

    29
    Consider the following data (i) 2Al(s)+6HCl(aq)→Al2Cl6(aq)+3H2( g)+1200 kJ/mol2Al(s) + 6HCl(aq) \rightarrow {Al}_{2}{Cl}_{6}(aq) + 3H_{2}(\text{ }g) + 1200\text{ }kJ/mol. (ii) H2( g)+Cl2( g)→2HCl(g)+164 kJ/molH_{2}(\text{ }g) + {Cl}_{2}(\text{ }g) \rightarrow 2HCl(g) + 164\text{ }kJ/mol. (iii) HCl(g)+aq→HCl(aq)+83 kJ/molHCl(g) + aq \rightarrow HCl(aq) + 83\text{ }kJ/mol. (iv) Al2Cl6( s)+aq→Al2Cl6(aq)+663 kJ/mol{Al}_{2}{Cl}_{6}(\text{ }s) + aq \rightarrow {Al}_{2}{Cl}_{6}(aq) + 663\text{ }kJ/mol. The enthalpy of formation of anhydrous solid Al2Cl6Al_{2}Cl_{6} is :

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  2. Question 2

    Classification of Elements and Periodicity. Asked once: 5 Apr 2026 S2

    28
    The covalent radii of atoms AA and BB are rAr_{A} and rBr_{B}, respectively. The covalent bond length and total length of AB molecule are respectively :

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  3. Question 3

    Coordination Compounds. Asked once: 22 Jan 2026 S1

    33
    A first row transition metal (M) does not liberate H2H_{2} gas from dilute HCl. 1 mol of aqueous solution of MSO4MSO_{4} is treated with excess of aqueous KCN and then H2 S( g)H_{2}\text{ }S(\text{ }g) is passed through the solution. The amount of MS (metal sulphide) formed from the above reaction is ____\_\_\_\_ mol.

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  4. Question 4

    Electrochemistry. Asked once: 28 Jan 2026 S1

    47
    Consider the following redox reaction taking place in acidic medium
    BH4−(aq)+ClO3−(aq)→H2BO3−(aq)+Cl−(aq){BH}_{4}^{-}(aq) + {ClO}_{3}^{-}(aq) \rightarrow H_{2}{BO}_{3}^{-}(aq) + {Cl}^{-}(aq)
    If the Nernst equation for the above balanced reaction is Ecell =Ecell 0−RTnFln⁡QE_{\text{cell~}} = E_{\text{cell~}}^{0} - \frac{RT}{nF}\ln Q, Then the value of nn is ____\_\_\_\_ (Nearest integer)

  5. Question 5

    Equilibrium. Asked once: 3 Apr 2025

    28
    Given below are two statements Statement I : A catalyst cannot alter the equilibrium constant (Kc)\left( K_{c} \right) of the reaction, temperature remaining constant Statement II : A homogenous catalyst can change the equilibrium composition of a system temperature remaining constant In the light of the above statements, choose the correct answer from the options given below

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