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Day 263: JEE Mains Chemistry

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

  1. Question 1

    Chemical Thermodynamics. Asked once: 13 Apr 2023 (same type asked 3 times) See all 3 of this type

    54
    A2+B2→2AB⋅ΔHf0=−200kJmol−1A_{2}+B_{2}\rightarrow 2AB \cdot \Delta H_{f}^{0}= - 200kJmol^{- 1} AB,A2AB,A_{2} and B2B_{2} are diatomic molecule. If the bond enthalpies of A2,B2A_{2},B_{2} and ABAB are in the ratio 1:0.5:1, then the bond enthalpy of A2A_{2} is_________ kJmol−1kJmol^{- 1} (Nearest integer)

  2. Question 2

    Organic Chemistry - Some Basic Principles and Techniques. Asked once: 2021 Paper 13 (same type asked 3 times) See all 3 of this type

    32
    Number of acyclic structural isomers for pentene are:

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  3. Question 3

    The d- and f-Block Elements. Asked once: 2021 Paper 22 (same type asked 3 times) See all 3 of this type

    34
    In the structure of the dichromate ion, there is a:

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  4. Question 4

    Classification of Elements and Periodicity. Asked once: 8 Apr 2023 (same type asked 3 times) See all 3 of this type

    48
    The correct order of electronegativity for given elements is:

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  5. Question 5

    Coordination Compounds. Asked once: 22 Jan 2025 (same type asked 3 times) See all 3 of this type

    117
    Identify the homoleptic complex(es) that is/are low spin. (A) [Fe(CN)5NO]2−\left\lbrack Fe(CN)_{5}NO \right\rbrack^{2 -} (B) [CoF6]3−\left\lbrack CoF_{6} \right\rbrack^{3 -} (C) [Fe(CN)6]4−\left\lbrack Fe(CN)_{6} \right\rbrack^{4 -} (D) [Co(NH3)6]3+\left\lbrack Co\left( NH_{3} \right)_{6} \right\rbrack^{3 +} (E) [Cr(H2O)6]2+\left\lbrack Cr\left( H_{2}O \right)_{6} \right\rbrack^{2 +} Choose the correct answer from the options given below :

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