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Day 493: JEE Mains Chemistry

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

  1. Question 1

    Some Basic Concepts of Chemistry. Asked once: 2021 Paper 12

    33
    If equimolar mixture of NaOHNaOH and Na2CO3Na_{2}CO_{3} weight 4 g4\text{ }g then weight of NaOHNaOH is:

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  2. Question 2

    Structure of Atom. Asked once: 25 Jan 2023

    144
    The number of given orbitals which have electron density along the axis is
    px, py, pz, dxy, dyz, dxz, dz2, dx2−y2p_{x},\ p_{y},\ p_{z},\ d_{xy},\ d_{yz},\ d_{xz},\ d_{z^{2}},\ d_{x^{2}-y^{2}}

  3. Question 3

    The d- and f-Block Elements. Asked once: 2021 Paper 23

    32
    The Eu2+Eu^{2 +} ion is a strong reducing agent in spite of its ground state electronic configuration (outermost) : [Atomic number of Eu=63Eu = 63 ]

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  4. Question 4

    The p-Block Elements. Asked once: 13 Apr 2023

    144
    If the formula of Borax is Na2 B4Ox(OH)y⋅zH2ONa_{2}{\text{ }B}_{4}O_{x}(OH)_{y}\cdot zH_{2}O, then x+y+z=x + y + z =___

  5. Question 5

    Alcohols, Phenols and Ethers. Asked once: 30 Jan 2023

    56
    A trisubstituted compound ' AA ', C10H12O2C_{10}H_{12}O_{2} gives neutral FeCl3FeCl_{3} test positive. Treatment of compound 'A' with NaOHNaOH and CH3CH_{3} Br gives C11H14O2C_{11}H_{14}O_{2}, with hydroiodic acid gives methyl iodide and with hot conc. NaOHNaOH gives a compound B,C10H12O2B,C_{10}H_{12}O_{2}. Compound 'A' also decolorises alkaline KMnO4KMnO_{4}. The number of π\pi bond/s present in the compound ' AA ' is