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Day 165: JEE Mains Chemistry

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

  1. Question 1

    Chemical Thermodynamics. Asked once: 28 Jan 2025 (same type asked 3 times) See all 3 of this type

    50
    The formation enthalpies, ΔHfΘ\Delta H_{f}^{\Theta} for H(g)H_{(g)} and O(g)O_{(g)} are 220.0 and 250.0 kJ mol−1250.0\text{ }kJ{\text{ }mol}^{- 1}, respectively, at 298.15 K , and ΔHf⊖\Delta H_{f}^{\ominus} for H2O(g)H_{2}O_{(g)} is −242.0 kJ mol−1- 242.0\text{ }kJ{\text{ }mol}^{- 1} at the same temperature. The average bond enthalpy of the O−HO - H bond in water at 298.15 K is ____\_\_\_\_ kJmol−1kJmol^{- 1} (nearest integer).

  2. Question 2

    Electrochemistry. Asked once: 31 Jan 2023 (same type asked 3 times) See all 3 of this type

    53
    The logarithm of equilibrium constant for the reaction Pd2++4Cl−⇌PdCl42−Pd^{2 +}+ 4Cl^{-}\rightleftharpoons PdCl_{4}^{2 -} is (Nearest integer)
     Given : 2.303RTF=0.06 VPd(aq)2++2e−⇌Pd(s)E⊖=0.83 VPdCl42−(aq)+2e−⇌Pd(s)+4Cl−(aq)Eθ=0.65 V\begin{matrix} & \text{~Given :~}\frac{2.303RT}{F}= 0.06\text{ }V \\ & Pd_{(aq)}^{2 +}+ 2e^{-}\rightleftharpoons Pd(s)E^{\ominus}= 0.83\text{ }V \\ & PdCl_{4}^{2 -}(aq) + 2e^{-}\rightleftharpoons Pd(s) + 4Cl^{-}(aq)E^{\theta}= 0.65\text{ }V \end{matrix}

  3. Question 3

    The d- and f-Block Elements. Asked once: 1 Feb 2023 (same type asked 3 times) See all 3 of this type

    38
    Highest oxidation state of MnMn is exhibited in Mn2O7Mn_{2}O_{7}. The correct statements about Mn2O7Mn_{2}O_{7} are (A) MnMn is tetrahedrally surrounded by oxygen atoms. (B) MnMn is octahedrally surrounded by oxygen atoms. (C) Contains Mn-O-Mn bridge. (D) Contains Mn-Mn bond. Choose the correct answer from the options given below:

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  4. Question 4

    The p-Block Elements. Asked once: 29 Jan 2023 (same type asked 3 times) See all 3 of this type

    35
    The bond dissociation energy is highest for

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  5. Question 5

    Biomolecules. Asked once: 29 Jan 2025 (same type asked 3 times) See all 3 of this type

    104
    Identify the essential amino acids from below : (a) Valine (b) Proline (c) Lysine (d) Threonine (e) Tyrosine Choose the correct answer from the options given below :

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