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Day 222: JEE Mains Chemistry

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

  1. Question 1

    Biomolecules. Asked once: 28 Jan 2025 (same type asked 6 times) See all 6 of this type

    107
    Identify correct conversion during acidic hydrolysis from the following : (a) starch gives galactose. (b) cane sugar gives equal amount of glucose and fructose. (c) milk sugar gives glucose and galactose. (d) amylopectin gives glucose and fructose. (e) amylose gives only glucose. Choose the correct answer from the options given below :

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  2. Question 2

    Chemical Kinetics. Asked once: 1 Feb 2024 (same type asked 6 times) See all 6 of this type

    142
    The following data were obtained during the first order thermal decomposition of a gas AA at constant volume:
    A(g)→2 B( g)+C(g)A(g) \rightarrow 2\text{ }B(\text{ }g) + C(g)
    S. No.Time/sTotal pressure/atm
    100.1
    21150.28
    The rate constant of the reaction is ______ ×10−2 s−1\times10^{- 2}{\text{ }s}^{- 1} (nearest integer)

  3. Question 3

    The d- and f-Block Elements. Asked once: 29 Jan 2024 (same type asked 6 times) See all 6 of this type

    33
    In chromyl chloride test for confirmation of Cl−Cl^{-} ion, a yellow solution is obtained. Acidification of the solution and addition of amyl alcohol and 10%10\% H2O2H_{2}O_{2} turns organic layer blue indicating formation of chromium pentoxide. The oxidation state of chromium in that is

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  4. Question 4

    The d- and f-Block Elements. Asked once: 4 Apr 2025 (same type asked 6 times) See all 6 of this type

    116
    ' X ' is the number of electrons in t2 gt_{2\text{ }g} orbitals of the most stable complex ion among [Fe(NH3)6]3+\left\lbrack Fe\left( NH_{3} \right)_{6} \right\rbrack^{3 +}, [FeCl6]3−, [Fe(C2O4)3]3−\left\lbrack FeCl_{6} \right\rbrack^{3 -},\ \left\lbrack Fe\left( C_{2}O_{4} \right)_{3} \right\rbrack^{3 -} and  [Fe(H2O)6]3+\ \left\lbrack Fe\left( H_{2}O \right)_{6} \right\rbrack^{3 +}. The nature of oxide of vanadium of the type V2OXV_{2}O_{X} is:

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  5. Question 5

    Organic Chemistry - Some Basic Principles and Techniques. Asked once: 31 Jan 2024 (same type asked 6 times) See all 6 of this type

    42
    'Adsorption' principle is used for which of the following purification method?

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