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Day 256: 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 22 (same type asked 3 times) See all 3 of this type

    37
    Which one of the following lanthanides exhibits +2 oxidation state with diamagnetic nature? (Given ZZ for Nd=60,Yb=70,La=57,Ce=58Nd = 60,Yb = 70,La = 57,Ce = 58 )

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  2. Question 2

    The d- and f-Block Elements. Asked once: 5 Apr 2024 (same type asked 3 times) See all 3 of this type

    52
    In a borax bead test under hot condition, a metal salt (one from the given) is heated at point BB of the flame, resulted in green colour salt bead. The spin-only magnetic moment value of the salt is ............. BM (Nearest integer) [Given atomic number of Cu=29,Ni=28Cu = 29,Ni = 28, Mn=25,Fe=26]Mn = 25,Fe = 26\rbrack

  3. Question 3

    Biomolecules. Asked once: 2021 Paper 13 (same type asked 3 times) See all 3 of this type

    33
    Thiamine and pyridoxine are respectively:

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  4. Question 4

    Electrochemistry. Asked once: 25 Jun 2022 (same type asked 3 times) See all 3 of this type

    57
    In a cell, the following reactions take place
    Fe2+→Fe3++e−EFe3+/Fe2+o=0.77 V2I−→I2+2e−EI2/I−o=0.54 V\begin{matrix} Fe^{2 +}\rightarrow Fe^{3 +}+e^{-} & E_{Fe^{3 +}/Fe^{2 +}}^{o}= 0.77\text{ }V \\ 2I^{-}\rightarrow I_{2}+ 2e^{-} & E_{I_{2}/I^{-}}^{o}= 0.54\text{ }V \end{matrix}
    The standard electrode potential for the spontaneous reaction in the cell is x×10−2 Vx \times10^{- 2}\text{ }V at 298 K298\text{ }K. The value of xx is (Nearest Integer)

  5. Question 5

    Alcohols, Phenols and Ethers. Asked once: 10 Apr 2023 (same type asked 3 times) See all 3 of this type

    121
    Incorrect method of preparation for alcohols from the following is:

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