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Day 170: JEE Mains Chemistry

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

  1. Question 1

    Equilibrium. Asked once: 5 Apr 2024 (same type asked 3 times) See all 3 of this type

    32
    The following reaction occurs in the blast furnace where iron ore is reduced to iron metal
    Fe2O3( s)+3CO(g)⇌2Fe(l)+3CO2( g)Fe_{2}O_{3(\text{ }s)}+ 3CO_{(g)}\rightleftharpoons 2Fe_{(l)}+ 3CO_{2(\text{ }g)}
    Using the Le Chatelier's principle, predict which one of the following will not disturb the equilibrium.

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  2. Question 2

    Structure of Atom. Asked once: 4 Apr 2024 (same type asked 3 times) See all 3 of this type

    54
    The de-Broglie's wavelength of an electron in the 4th 4^{\text{th~}} orbit is _____ πa0.(a0=\pi a_{0}.\left( a_{0}= \right. Bohr's radius ))

  3. Question 3

    Aldehydes, Ketones and Carboxylic Acids. Asked once: 2021 Paper 14 (same type asked 3 times) See all 3 of this type

    22
    Which of the following gives CO2CO_{2} on reaction with NaHCO3NaHCO_{3} ?

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  4. Question 4

    Some Basic Concepts of Chemistry. Asked once: 6 Apr 2024 (same type asked 3 times) See all 3 of this type

    136
    Match List-I with List-II.
    List-I (Reaction)List-II (Type of redox reaction)
    (A)N2(g)+O2(g)→2NO(g)N_{2}(g) + O_{2}(g) \rightarrow 2NO(g)(I)Decomposition
    (B)2Pb(NO3)2(s)→2PbO(s)+4NO2(g)+O2(g)2Pb(NO_{3})_{2}(s) \rightarrow 2PbO(s) + 4NO_{2}(g) + O_{2}(g)(II)Displacement
    (C)2Na(s)+2H2O(l)→2NaOH(aq)+H2(g)2Na(s) + 2H_{2}O(l) \rightarrow 2NaOH(aq) + H_{2}(g)(III)Disproportionation
    (D)2NO2(g)+2OH−(aq)→NO2−(aq)+NO3−(aq)+H2O(l)2NO_{2}(g) + 2OH^{-}(aq) \rightarrow NO_{2}^{-}(aq) + NO_{3}^{-}(aq) + H_{2}O(l)(IV)Combination
    Choose the correct answer from the options given below:

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  5. Question 5

    Structure of Atom. Asked once: 24 Jan 2025 (same type asked 3 times) See all 3 of this type

    104
    For hydrogen atom, the orbital/s with lowest energy is/are : (A) 4 s (B) 3px3p_{x} (C) 3dx2−y23d_{x^{2}-y^{2}} (D) 3 dz23{\text{ }d}_{z^{2}} (E) 4pz4p_{z} Choose the correct answer from the options given below :

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