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Day 121: JEE Mains Chemistry

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

  1. Question 1

    Some Basic Concepts of Chemistry. Asked once: 5 Apr 2024 (same type asked 7 times) See all 7 of this type

    135
    The number of moles of methane required to produce 11 gCO2( g)11\text{ }gCO_{2}(\text{ }g) after complete combustion is: (Given molar mass of methane in mol−1:16mol^{- 1}:16 )

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  2. Question 2

    The p-Block Elements. Asked once: 26 Jun 2022 (same type asked 7 times) See all 7 of this type

    127
    The oxide which contains an odd electron at the nitrogen atom is

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  3. Question 3

    Electrochemistry. Asked once: 24 Jan 2025 (same type asked 6 times) See all 6 of this type

    26
    For the given cell
    Fe2+(aq)+Ag+(aq)→Fe3+(aq)+Ag( s)Fe^{2 +}(aq) +Ag^{+}(aq) \rightarrow Fe^{3 +}(aq) + Ag(\text{ }s)
    The standard cell potential of the above reaction is Given :
    Ag++e−→Ag   E0=xVFe2++2e−→Fe   E0=yVFe3++3e−→Fe    E0=zV\begin{matrix} Ag^{+}+e^{-}\rightarrow Ag & \ \ \ E^{0}= xV \\ Fe^{2 +}+ 2e^{-}\rightarrow Fe & \ \ \ E^{0}= yV \\ Fe^{3 +}+ 3e^{-}\rightarrow Fe & \ \ \ \ E^{0}= zV \end{matrix}

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  4. Question 4

    Equilibrium. Asked once: 4 Apr 2026 S1 (same type asked 6 times) See all 6 of this type

    30
    At T(K)T(K), the equilibrium constant of A2( g)+B2( g)⇌C(g)A_{2}(\text{ }g) +B_{2}(\text{ }g) \rightleftharpoons C(g) is 2.7×10−52.7 \times10^{- 5}. What is the equilibrium constant for 13 A2( g)+13 B2( g)⇌13C(g)\frac{1}{3}{\text{ }A}_{2}(\text{ }g) +\frac{1}{3}{\text{ }B}_{2}(\text{ }g) \rightleftharpoons\frac{1}{3}C(g) at the same temperature?

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  5. Question 5

    Chemical Bonding and Molecular Structure. Asked once: 23 Jan 2025 (same type asked 6 times) See all 6 of this type

    44
    Match the LIST-I with LIST-II
    LIST-I (Classification of molecules based on octet rule)LIST-II (Example)
    (A)Molecules obeying octet rule(I)
    NO,NO2NO,NO_{2}
    (B)Molecules with incomplete octet(II)
    BCl3,AlCl3BCl_{3},AlCl_{3}
    (C)Molecules with incomplete octet with odd electron(III)
    H2SO4,PCl5H_{2}SO_{4},PCl_{5}
    (D)Molecules with expanded octet(IV)
    CCl4,CO2CCl_{4},CO_{2}
    Choose the correct answer from the options given below :

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