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Day 281: JEE Mains Chemistry

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

  1. Question 1

    Organic Chemistry - Some Basic Principles and Techniques. Asked once: 21 Jan 2026 S1 (same type asked 8 times) See all 8 of this type

    33
    In Carius method, 0.75 g of an organic compound gave 1.2 g of barium sulphate, find percentage of sulphur (molar mass 32 g mol−132\text{ }g{\text{ }mol}^{- 1}). Molar mass of barium sulphate is 233 g mol−1233\text{ }g{\text{ }mol}^{- 1}.

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  2. Question 2

    Some Basic Concepts of Chemistry. Asked once: 4 Apr 2025 (same type asked 8 times) See all 8 of this type

    122
    The amount of calcium oxide produced on heating 150 kg limestone ( 75%75\% pure) is kg . (Nearest integer).Given : Molar mass (in gmol−1g{mol}^{- 1} ) of Ca−40,O−16,C−12Ca - 40,O - 16,C - 12

  3. Question 3

    Some Basic Concepts of Chemistry. Asked once: 27 Jul 2022 (same type asked 8 times) See all 8 of this type

    51
    20 mL20\text{ }mL of 0.02MK2Cr2O70.02MK_{2}Cr_{2}O_{7} solution is used for the titration of 10 mL10\text{ }mL of Fe2+Fe^{2 +} solution in the acidic medium. The molarity of Fe2+Fe^{2 +} solution is ×10−2M\times10^{- 2}M (Nearest Integer)

  4. Question 4

    Classification of Elements and Periodicity. Asked once: 23 Jan 2026 S2 (same type asked 8 times) See all 8 of this type

    34
    Given below are two statements : Statement I: The second ionisation enthalpy of Na is larger than the corresponding ionisation enthalpy of Mg. Statement II : The ionic radius of O2−O^{2 -} is larger than that of F−F^{-}. In the light of the above statements, choose the correct answer from the options given below.

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  5. Question 5

    Classification of Elements and Periodicity. Asked once: 11 Apr 2023 (same type asked 8 times) See all 8 of this type

    39
    For elements B, C, N, Li, Be, O and F the correct order of first ionization enthalpy is

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