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Day 193: JEE Mains Chemistry

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

  1. Question 1

    Structure of Atom. Asked once: 14 Jun 2022 (same type asked 2 times) See all 2 of this type

    32
    Consider the following pairs of electrons (A) (a) n=3,l=1,ml=1,ms=+12n = 3,l = 1,m_{l}= 1,m_{s}= +\frac{1}{2} (b) n=3,l=2,ml=1,ms=+12n = 3,l = 2,m_{l}= 1,m_{s}= +\frac{1}{2} (B) (a) n=3,l=2,ml=−2,ms=−12n = 3,l = 2,m_{l}= - 2,m_{s}= -\frac{1}{2} (b) n=3,l=2,ml=−1,ms=−12n = 3,l = 2,m_{l}= - 1,m_{s}= -\frac{1}{2} (C) (a) n=4,l=2,ml=2,ms=+12n = 4,l = 2,m_{l}= 2,m_{s}= +\frac{1}{2} (b) n=3,l=2,ml=2,ms=+12n = 3,l = 2,m_{l}= 2,m_{s}= +\frac{1}{2} The pairs of electron present in degenerate orbitals is/are:

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  2. Question 2

    Aldehydes, Ketones and Carboxylic Acids. Asked once: 6 Apr 2024 (same type asked 2 times) See all 2 of this type

    47
    Which among the following aldehydes is most reactive towards nucleophilic addition reactions?

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  3. Question 3

    Chemical Bonding and Molecular Structure. Asked once: 31 Jan 2024 (same type asked 2 times) See all 2 of this type

    47
    The linear combination of atomic orbitals to form molecular orbitals takes place only when the combining atomic orbitals (A) have the same energy (B) have the minimum overlap (C) have same symmetry about the molecular axis (D) have different symmetry about the molecular axis Choose the most appropriate from the options given below:

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  4. Question 4

    Classification of Elements and Periodicity. Asked once: 2021 Paper 6 (same type asked 2 times) See all 2 of this type

    34
    Identify the elements XX and YY using the ionisation energy values (kJ/mol) given below:
    Element1st IE2nd IE
    X4954563
    Y7311450

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  5. Question 5

    Some Basic Concepts of Chemistry. Asked once: 2021 Paper 17 (same type asked 2 times) See all 2 of this type

    53
    2SO2( g)+O2( g)→2SO3( g)2SO_{2}(\text{ }g) +O_{2}(\text{ }g) \rightarrow 2SO_{3}(\text{ }g) The above reaction is carried out in a vessel starting with partial pressure PSO2=250mbarP_{SO_{2}}= 250mbar, PO2=750 mP_{O_{2}}= 750\text{ }m bar and PSO3=0P_{SO_{3}}= 0 bar. When the reaction is complete, the total pressure in the reaction vessel is mm bar. (Round off of the nearest integer).