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Day 258: JEE Mains Chemistry

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

  1. Question 1

    Structure of Atom. Asked once: 23 Jan 2025 (same type asked 3 times) See all 3 of this type

    27
    Heat treatment of muscular pain involves radiation of wavelength of about 900 nm . Which spectral line of H atom is suitable for this ? Given: Rydberg constant
     RH=105 cm−1, h=6.6×10−34 J s,c=3×108 m/s)\left. \ R_{H}=10^{5}{\text{ }cm}^{- 1},\text{ }h = 6.6 \times10^{- 34}\text{ }J\text{ }s,c = 3 \times10^{8}\text{ }m/s \right)

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  2. Question 2

    Hydrocarbons. Asked once: 2021 Paper 23 (same type asked 3 times) See all 3 of this type

    31
    Arrange the following conformational isomers of n-butane in order of their increasing potential energy:

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  3. Question 3

    Solutions. Asked once: 14 Jun 2022 (same type asked 3 times) See all 3 of this type

    142
    A company dissolves 'XX' amount of CO2CO_{2} at 298 K298\text{ }K in 1 litre of water to prepare soda water. X=000‾×10−3 gX = \underline{\phantom{000}} \times 10^{-3}\text{ }g. (nearest integer) (Given: partial pressure of CO2CO_{2} at 298 K=0.835298\text{ }K = 0.835 bar. Henry's law constant for CO2CO_{2} at 298 K=1.67 kbar298\text{ }K = 1.67\ kbar. Atomic mass of HH, CC and OO is 1, 12 and 16 g mol−116\text{ }g\text{ }mol^{-1}, respectively)

  4. Question 4

    Amines. Asked once: 2021 Paper 24 (same type asked 3 times) See all 3 of this type

    46
    Which one of the following gives the most stable Diazonium salt?

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  5. Question 5

    Biomolecules. Asked once: 29 Jun 2022 (same type asked 3 times) See all 3 of this type

    48
    Sugar moiety in DNA and RNA molecules respectively are

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