JEE Main & Advanced Chemistry The s-Block Elements Question Bank Alkali Metals

  • question_answer \[K,\] \[Ca\] and \[Li\] metals may be arranged in the decreasing order of their standard electrode potentials as [CPMT 1990]

    A) \[K,\] \[Ca,\] \[Li\]

    B) \[Li,\] \[K,\] \[Ca\]

    C) \[Li,\] \[Ca,\] \[K\]

    D) \[Ca,\] \[Li,\] \[K\]

    Correct Answer: B

    Solution :

    \[L{{i}^{+}}+{{e}^{-}}\to Li\], \[{{E}^{o}}=-3.05\ V\] \[{{K}^{+}}+{{e}^{-}}\to K\], \[{{E}^{o}}=-2.93\ V\] \[C{{a}^{+2}}+2{{e}^{-}}\to Ca\], \[{{E}^{o}}=-2.87\ V\]

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