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Day 339: JEE Mains Chemistry

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

  1. Question 1

    The d- and f-Block Elements. Asked once: 2021 Paper 15 (same type asked 5 times) See all 5 of this type

    24
    The number of electrons in the 4f4f orbitals of Ho3+ (Z=67)Ho^{3 +}\ (Z = 67) is:

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  2. Question 2

    Organic Chemistry - Some Basic Principles and Techniques. Asked once: 25 Jul 2022 (same type asked 5 times) See all 5 of this type

    149
    The separation of two coloured substances was done by paper chromatography. The distances travelled by solvent front, substance A and substance BB from the base line are 3.25 cm3.25\text{ }cm, 2.08 cm2.08\text{ }cm and 1.05 cm1.05\text{ }cm respectively. The ratio of RfR_{f} values of AA to BB is ____

  3. Question 3

    Amines. Asked once: 2021 Paper 10 (same type asked 5 times) See all 5 of this type

    37
    An organic compound "A" on treatment with benzene sulphonyl chloride gives compound BB. BB is soluble in dil. NaOHNaOH solution. Compound AA is :

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  4. Question 4

    Solutions. Asked once: 1 Feb 2023 (same type asked 5 times) See all 5 of this type

    147
    20%20\% of acetic acid is dissociated when its 5 g5\text{ }g is added to 500 mL500\text{ }mL of water. The depression in freezing point of such water is ___×10−3 ∘C\_\_\_ \times10^{- 3}\ ^{\circ}C Atomic mass of C,HC,H and OO are 12,1 and 16 a.m.u. respectively. [Given: Molal depression constant and density of water are 1.86 K kg mol−11.86\text{ }K\text{ }kg{\text{ }mol}^{- 1} and 1 g cm−31\text{ }g{\text{ }cm}^{- 3} respectively.

  5. Question 5

    Chemical Bonding and Molecular Structure. Asked once: 27 Jan 2024 (same type asked 5 times) See all 5 of this type

    39
    Choose the polar molecule from the following:

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