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NEET Chemistry NEET PYQ-The d-and f-Block Elements

  • question_answer
    Four successive members of the first series of the transition metals are listed below. For which one of them the standard potential \[({{E}^{o}}_{{{M}^{2+}}/M})\]positive sign?                            [AIPMT (M) 2012]

    A) Co (Z = 27)

    B) Ni (Z = 28)

    C) Cu (Z = 29)

    D) Fe (Z = 26)

    Correct Answer: D

    Solution :

    [d] In 3d-series melting point increases as we move from left to right. But \[Mn\]shows low melting point due to its complex formatting nature. It is unable to form metallic and covalent bonds.
                Element Second ionisation enthalpy
    \[Ti\] 1320
    \[V\] 1376
    \[Cr\] 1513
    \[Mn\] 1635


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