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Day 402: JEE Mains Chemistry

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

  1. Question 1

    Some Basic Concepts of Chemistry. Asked once: 29 Jan 2025

    109
    0.1 M solution of KI reacts with excess of H2SO4H_{2}SO_{4} and KIO3KIO_{3} solution. According to equation
    5I−+IO3−+6H+→3I2+3H2O5I^{-}+IO_{3}^{-}+ 6H^{+}\rightarrow 3I_{2}+ 3H_{2}O
    Identify the correct statements : (A) 200 mL of KI solution reacts with 0.004 mol of KIO3KIO_{3} (B) 200 mL of KI solution reacts with 0.006 mol of H2SO4H_{2}SO_{4} (C) 0.5 L of KI solution produced 0.005 mol of I2I_{2} (D) Equivalent weight of KIO3KIO_{3} is equal to
    ( Molecular weight 5)\left( \frac{\text{~Molecular weight~}}{5} \right)
    Choose the correct answer from the options given below:

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  2. Question 2

    Structure of Atom. Asked once: 23 Jan 2026 S2

    39
    Identify the INCORRECT statements from the following: (A) Notation  1224Mg\ _{12}^{24}Mg represents 24 protons and 12 neutrons. (B) Wavelength of a radiation of frequency 4.5×1015 s−14.5 \times 10^{15}{\text{ }s}^{- 1} is 6.7×10−8 m6.7 \times 10^{- 8}\text{ }m. (C) One radiation has wavelength =λ1(900 nm)= \lambda_{1}(900\text{ }nm) and energy =E1= E_{1}. Other radiation has wavelength =λ2(300 nm)= \lambda_{2}(300\text{ }nm) and energy =E2⋅E1:E2=3:1= E_{2} \cdot E_{1}:E_{2} = 3:1. (D) Number of photons of light of wavelength 2000 pm that provides 1 J of energy is 1.006×10161.006 \times 10^{16}. Choose the correct answer from the options given below:

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  3. Question 3

    The d- and f-Block Elements. Asked once: 22 Jan 2026 S2

    48
    Among the following oxides of 3d elements, the number of mixed oxides are ____\_\_\_\_ .
    Ti2O3, V2O4,Cr2O3,Mn3O4,Fe3O4,Fe2O3,Co3O4{Ti}_{2}O_{3},{\text{ }V}_{2}O_{4},{Cr}_{2}O_{3},{Mn}_{3}O_{4},{Fe}_{3}O_{4},{Fe}_{2}O_{3},{Co}_{3}O_{4}

  4. Question 4

    The p-Block Elements. Asked once: 24 Jan 2026 S1

    35
    Consider three metal chlorides x,yx,y and z , where x is water soluble at room temperature, yy is sparingly soluble in water at room temperature and z is soluble in hot water. x,yx,y and z are respectively

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  5. Question 5

    Alcohols, Phenols and Ethers. Asked once: 28 Jan 2026 S1

    29
    Consider the following reaction sequence Compound (x) → (i) CO2,NaOH,120∘C, high pressure (ii) H3O+\underset{(ii)\ H_{3}O^{+}}{\overset{\begin{matrix} \text{~(i)~}CO_{2},NaOH,120^{\circ}C, \\ \text{~high pressure~} \end{matrix}}{\rightarrow}} Compound (y) (Major Product) [76.6%C,6.38%H,vapour density 47]\lbrack 76.6\% C,6.38\% H\text{,vapour density~}47\rbrack Compound (y) develops characteristic colour with neutral FeCl3FeCl_{3} solution. Identify the INCORRECT statement from the following for the above sequence.

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