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Day 295: JEE Mains Chemistry

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

  1. Question 1

    Chemical Kinetics. Asked once: 29 Jul 2022 (same type asked 5 times) See all 5 of this type

    145
    Assuming 1μg1\mu g of trace radioactive element XX with a half life of 30 years is absorbed by a growing tree. The amount of XX remaining in the tree after 100 years is ____×10−1μg\_\_\_\_ \times10^{- 1}\mu g. [Given: ln⁡10=2.303; log⁡2=0.30\ln10 = 2.303;\ \log2 = 0.30 ]

  2. Question 2

    Chemical Kinetics. Asked once: 25 Jun 2022 (same type asked 5 times) See all 5 of this type

    58
    For a given chemical reaction
    γ1 A+γ2 B→γ3C+γ4D\gamma_{1}\text{ }A +\gamma_{2}\text{ }B \rightarrow\gamma_{3}C +\gamma_{4}D
    Concentration of CC changes from 10mmol10mmol dm−3dm^{- 3} to 20mmoldm −320mmoldm\ ^{- 3} in 10 seconds. Rate of appearance of DD is 1.5 times the rate of disappearance of BB which is twice the rate of disappearance AA. The rate of appearance of DD has been experimentally determined to be 9mmol9mmol dm−3 s−1dm^{- 3}{\text{ }s}^{- 1}. Therefore the rate of reaction is moldm −3 s−1moldm\ ^{- 3}{\text{ }s}^{- 1}. (Nearest Integer)

  3. Question 3

    Equilibrium. Asked once: 31 Jan 2023 (same type asked 5 times) See all 5 of this type

    57
    For reaction: SO2( g)+12O2( g)⇌SO3( g)SO_{2}(\text{ }g) +\frac{1}{2}O_{2}(\text{ }g) \rightleftharpoons SO_{3}(\text{ }g) Kp=2×1012K_{p}= 2 \times10^{12} at 27∘C27^{\circ}C and 1 atm1\text{ }atm pressure. The KcK_{c} for the same reaction is ____\_\_\_\_ ×1013\times10^{13}. (Nearest integer) (Given R=0.082 L atm K−1 mol−1R = 0.082\text{ }L\text{ }atm{\text{ }K}^{- 1}{\text{ }mol}^{- 1} )

  4. Question 4

    Structure of Atom. Asked once: 27 Jan 2024 (same type asked 5 times) See all 5 of this type

    58
    The number of electrons present in all the completely filled subshells having n=4n = 4 and s=+12s = +\frac{1}{2} is _____ . (Where n=n = principal quantum number and s=s = spin quantum number)

  5. Question 5

    Chemical Bonding and Molecular Structure. Asked once: 13 Apr 2023 (same type asked 5 times) See all 5 of this type

    36
    Among the following compounds, the one which shows highest dipole moment is

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