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Day 289: JEE Mains Chemistry

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

  1. Question 1

    Structure of Atom. Asked once: 13 Apr 2023 (same type asked 6 times) See all 6 of this type

    48
    The energy of an electron in the first Bohr orbit of hydrogen atom is −2.18×10−18J- 2.18 \times10^{- 18}J. Its energy in the third Bohr orbit is___

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  2. Question 2

    The d- and f-Block Elements. Asked once: 28 Jan 2025 (same type asked 6 times) See all 6 of this type

    44
    Which of the following oxidation reactions are carried out by both K2Cr2O7K_{2}Cr_{2}O_{7} and KMnO4KMnO_{4} in acidic medium? (A) I−→I2I^{-}\rightarrow I_{2} (B) S2−→SS^{2 -}\rightarrow S (C) Fe2+→Fe3+Fe^{2 +}\rightarrow Fe^{3 +} (D) I−→IO3−I^{-}\rightarrow IO_{3}^{-} (E) S2O3 2−→SO4 2−S_{2}O_{3}\ ^{2 -}\rightarrow SO_{4}\ ^{2 -} Choose the correct answer from the options given below :

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  3. Question 3

    Equilibrium. Asked once: 24 Jan 2023 (same type asked 6 times) See all 6 of this type

    57
    The dissociation constant of acetic acid is x×10−5x \times10^{- 5}. When 25 mL25\text{ }mL of 0.2MCH3COONa0.2MCH_{3}COONa solution is mixed with 25 mL25\text{ }mL of 0.02MCH3COOH0.02MCH_{3}COOH solution, the pHpH of the resultant solution is found to be equal to 5 . The value of xx is

  4. Question 4

    Aldehydes, Ketones and Carboxylic Acids. Asked once: 3 Apr 2025 (same type asked 6 times) See all 6 of this type

    36
    Number of molecules from below which cannot give iodoform reaction is :Ethanol, Isopropyl alcohol, Bromoacetone, 2-Butanol, 2-Butanone, Butanal, 2-Pentanone, 3-Pentanone, Pentanal and 3-Pentanol

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  5. Question 5

    Biomolecules. Asked once: 28 Jun 2022 (same type asked 6 times) See all 6 of this type

    139
    When sugar ' XX ' is boiled with dilute H2SO4H_{2}SO_{4} in alcoholic solution, two isomers ' AA ' and ' BB ' are formed. 'A' on oxidation with HNO3HNO_{3} yields saccharic acid whereas ' BB ' is laevorotatory. The compound ' XX ' is:

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