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Day 221: JEE Mains Chemistry

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

  1. Question 1

    Solutions. Asked once: 11 Apr 2023 (same type asked 6 times) See all 6 of this type

    59
    0.004MK2SO40.004MK_{2}SO_{4} solution is isotonic with 0.01M0.01M glucose solution. Percentage dissociation of K2SO4K_{2}SO_{4} is ____(Nearest integer)

  2. Question 2

    Structure of Atom. Asked once: 22 Jan 2026 S1 (same type asked 6 times) See all 6 of this type

    29
    The energy required by electrons, present in the first Bohr orbit of hydrogen atom to be excited to second Bohr orbit is ____\_\_\_\_ Jmol−1Jmol^{- 1}. Given : RH=2.18×10−11R_{H}= 2.18 \times10^{- 11} ergs.

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  3. Question 3

    The d- and f-Block Elements. Asked once: 23 Jan 2026 S2 (same type asked 6 times) See all 6 of this type

    42
    The oxidation state of chromium in the final product formed in the reaction between KI and acidified K2Cr2O7K_{2}Cr_{2}O_{7} solution is:

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  4. Question 4

    Equilibrium. Asked once: 30 Jan 2024 (same type asked 6 times) See all 6 of this type

    145
    The pHpH of an aqueous solution containing 1M1M benzoic acid (pKa=4.20)\left( pK_{a}= 4.20 \right) and 1M1M sodium benzoate is 4.5. The volume of benzoic acid solution in 300 mLmL of this buffer solution is ______ mLmL.

  5. Question 5

    Aldehydes, Ketones and Carboxylic Acids. Asked once: 4 Apr 2025 (same type asked 6 times) See all 6 of this type

    103
    Which among the following compounds give yellow solid when reacted with NaOI/NaOHNaOI/NaOH ? (A) CH3−CH(OH)−C2H5{CH}_{3} - CH(OH) - {C}_{2}{H}_{5} (B) CH3−CH2−CH2−OH{CH}_{3} - {CH}_{2} - {CH}_{2} - OH (C) CH3−CO−C2H5{CH}_{3} - CO - {C}_{2}{H}_{5} (D) CH3COOH{CH}_{3}COOH (E) CH3−CH2−CHO{CH}_{3} - {CH}_{2} - CHO Choose the correct answer from the options given below:

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