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Day 270: JEE Mains Chemistry

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

  1. Question 1

    The d- and f-Block Elements. Asked once: 2021 Paper 8 (same type asked 3 times) See all 3 of this type

    39
    The common positive oxidation states for an element with atomic number 24, are:

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  2. Question 2

    Electrochemistry. Asked once: 27 Jan 2024 (same type asked 3 times) See all 3 of this type

    148
    The hydrogen electrode is dipped in a solution of pH=3pH = 3 at 25∘C25^{\circ}C. The potential of the electrode will be −____×10−2 V-\_\_\_\_\times10^{- 2}\text{ }V.
    (2.303RTF=0.059 V)\left( \frac{2.303RT}{F}= 0.059\text{ }V \right)

  3. Question 3

    Chemical Thermodynamics. Asked once: 29 Jan 2023 (same type asked 3 times) See all 3 of this type

    56
    Consider the following reaction approaching equilibrium at 27∘C27^{\circ}C and 1 atm1\text{ }atm pressure
    A+B⇌kf=103kr=102C+DA + B\underset{k_{r}=10^{2}}{\overset{k_{f}=10^{3}}{\rightleftharpoons}}C + D
    The standard Gibbs energy change (ΔrGθ)\left( \Delta_{r}G^{\theta} \right) at 27∘C27^{\circ}C is (−)( - ) ____\_\_\_\_ kJ mol−1kJ\,mol^{- 1} (Nearest integer). (Given: R=8.3 J K−1 mol−1R = 8.3\text{ }J{\text{ }K}^{- 1}{\text{ }mol}^{- 1} and ln⁡10=2.3\ln10 = 2.3 )

  4. Question 4

    Alcohols, Phenols and Ethers. Asked once: 29 Jun 2022 (same type asked 3 times) See all 3 of this type

    50
    Given below are two statements. Statement I: Phenols are weakly acidic. Statement II: Therefore, they are freely soluble in NaOHNaOH solution and are weaker acids than alcohols and water. Choose the most appropriate option:

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  5. Question 5

    Organic Chemistry - Some Basic Principles and Techniques. Asked once: 29 Jul 2022 (same type asked 3 times) See all 3 of this type

    133
    Correct structure of γ\gamma-methylcyclohexane carbaldehyde is:

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