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Day 129: JEE Mains Chemistry

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

  1. Question 1

    The d- and f-Block Elements. Asked once: 30 Jan 2023 (same type asked 5 times) See all 5 of this type

    39
    In the wet tests for identification of various cations by precipitation, which transition element cation doesn't belong to group IV in qualitative inorganic analysis?

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  2. Question 2

    Chemical Bonding and Molecular Structure. Asked once: 29 Jan 2025 (same type asked 5 times) See all 5 of this type

    125
    Total number of non -bonded electrons present in NO2−NO_{2}^{-}ion based on Lewis theory is ______\_\_\_\_\_\_ .

  3. Question 3

    Structure of Atom. Asked once: 31 Jan 2024 (same type asked 5 times) See all 5 of this type

    137
    The four quantum numbers for the electron in the outer most orbital of potassium (atomic no. 19) are

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  4. Question 4

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

    56
    A→BA \rightarrow B The rate constants of the above reaction at 200 K200\text{ }K and 300 K300\text{ }K are 0.03 min⁡−10.03{\text{ }\min}^{- 1} and 0.05 min⁡−10.05{\text{ }\min}^{- 1} respectively. The activation energy for the reaction is ____\_\_\_\_ J mol−1mol^{- 1} (Nearest integer) (Given : ln⁡10=2.3\ln10 = 2.3
    R=8.3 J K−1 mol−1log⁡5=0.70log⁡3=0.48log⁡2=0.30)\begin{matrix} & R = 8.3\text{ }J{\text{ }K}^{- 1}{\text{ }mol}^{- 1} \\ & \log5 = 0.70 \\ & \log3 = 0.48 \\ & \log2 = 0.30) \end{matrix}

  5. Question 5

    Solutions. Asked once: 22 Jan 2025 (same type asked 5 times) See all 5 of this type

    42
    Arrange the following solutions in order of their increasing boiling points. (i) 10−4MNaCl10^{- 4}MNaCl (ii) 10−4M10^{- 4}M Urea (iii) 10−3M NaCl10^{- 3}M\ NaCl (iv) 10−2MNaCl10^{- 2}MNaCl

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