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Day 115: 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 S2 (same type asked 8 times) See all 8 of this type

    27
    Match List-I with List-II.
    List-I Pair of CompoundsList-II Type of Isomers
    (A)2-Methylpropene and but-1-ene(I)Stereoisomers
    (B)Cis-but-2-ene and trans-but-2-ene(II)Position isomers
    (C)2-Butanol and diethyl ether(III)Chain isomers
    (D)But-1-ene and but-2-ene(IV)Functional group isomers
    Choose the correct answer from the options given below:

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  2. Question 2

    Structure of Atom. Asked once: 4 Apr 2026 S1 (same type asked 8 times) See all 8 of this type

    27
    What is the ratio of wave number of first line (lowest energy line) of Balmer series of H atomic spectrum to first line of its Brackett series?

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  3. Question 3

    Organic Chemistry - Some Basic Principles and Techniques. Asked once: 4 Apr 2026 S2 (same type asked 8 times) See all 8 of this type

    50
    In Sulphur estimation, 2.0×10−3 mol2.0 \times 10^{- 3}\text{ }mol of an organic compound (X) (molar mass 76 g mol−176\text{ }g{\text{ }mol}^{- 1} ) gave 0.4813 g of barium sulphate (molar mass 233gmol−1233{gmol}^{- 1} ). The percentage of sulphur in the compound ( X ) is ____\_\_\_\_ ×10−1%\times 10^{- 1}\% (Nearest integer)

  4. Question 4

    Some Basic Concepts of Chemistry. Asked once: 2 Apr 2026 S1 (same type asked 8 times) See all 8 of this type

    26
    The mass of iron converted into Fe3O4Fe_{3}O_{4} by the action of 18 g of steam is : (Given : Molar mass of H, O and Fe are 1, 16 and 56 g mol−156\text{ }g{\text{ }mol}^{- 1} respectively) Assume iron is present in excess :

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  5. Question 5

    Some Basic Concepts of Chemistry. Asked once: 23 Jan 2026 S2 (same type asked 8 times) See all 8 of this type

    48
    200 cc of x×10−3Mx \times 10^{- 3}M potassium dichromate is required to oxidise 750 cc of 0.6 M Mohr's salt solution in acidic medium. Here x=x =