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Day 446: JEE Mains Chemistry

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

  1. Question 1

    Some Basic Concepts of Chemistry. Asked once: 10 Apr 2023

    124
    Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: 3.1500 g3.1500\text{ }g of hydrated oxalic acid dissolved in water to make 250.0 mL250.0\text{ }mL solution will result in 0.1M0.1M oxalic acid solution. Reason R: Molar mass of hydrated oxalic acid is 126 g mol−1126\text{ }g{\text{ }mol}^{- 1}. In the light of the above statements, chose the correct answer from the options given below:

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  2. Question 2

    Structure of Atom. Asked once: 9 Apr 2024

    136
    Match List I with List II
    List-I (Element)List-II (Electronic Configuration)
    A.
    NN
    		I.
    [Ar]3 d104 s24p5\lbrack Ar\rbrack 3{\text{ }d}^{10}4{\text{ }s}^{2}4p^{5}
    B.
    SS
    		II.
    [Ne]3 s23p4\lbrack Ne\rbrack 3{\text{ }s}^{2}3p^{4}
    C.
    BrBr
    		III.
    [He]2 s22p3\lbrack He\rbrack 2{\text{ }s}^{2}2p^{3}
    D
    KrKr
    		IV.
    [Ar]3 d104 s24p6\lbrack Ar\rbrack 3{\text{ }d}^{10}4{\text{ }s}^{2}4p^{6}
    Choose the correct answer from the options given below:

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  3. Question 3

    The d- and f-Block Elements. Asked once: 13 Apr 2023

    59
    KMnO4KMnO_{4} is titrated with ferrous ammonium sulphate hexahydrate in presence of dilute H2SO4H_{2}SO_{4}. Number of water molecules produced for 2 molecules of KMnO4KMnO_{4} is___

  4. Question 4

    The p-Block Elements. Asked once: 8 Apr 2024

    39
    Thiosulphate reacts differently with iodine and bromine in the reaction given below:
    2 S2O32−+I2→S4O62−+2I−2{\text{ }S}_{2}O_{3}^{2 -}+I_{2}\rightarrow S_{4}O_{6}^{2 -}+ 2I^{-}
    S2O32−+5Br2+5H2O→2SO42−+4Br−+10H+S_{2}O_{3}^{2 -}+ 5Br_{2}+ 5H_{2}O \rightarrow 2SO_{4}^{2 -}+ 4Br^{-}+ 10H^{+}
    Which of the following statement justifies the above dual behaviour of thiosulphate?

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  5. Question 5

    Alcohols, Phenols and Ethers. Asked once: 5 Apr 2024

    54
    Consider the given chemical reaction sequence: Total sum of oxygen atoms in Product A and Product B are.......