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D and F Block Elements question

2012 · Q61
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D and F Block Elements question

2012 · Q61

NEETChemistryD and F Block ElementsMCQ+4 / −1
Four successive members of the first series of the transition metals are listed below. For which one of them the standard potential (EM2+/Mo)\left( {E_{{M^{2 + }}/M}^o} \right)(EM2+/Mo​) value has a positive sign?
  1. A
    Co (Z = 27)
  2. B
    Ni (Z = 28)
  3. C
    Cu (Z = 29)
  4. D
    Fe (Z = 26)
View written solutionFree

Correct answer: C

(ECo2+/Coo)\left( {E_{{Co^{2 + }}/Co}^o} \right)(ECo2+/Coo​) = -0.28

(ENi2+/Nio)\left( {E_{{Ni^{2 + }}/Ni}^o} \right)(ENi2+/Nio​) = -0.25

(ECu2+/Cuo)\left( {E_{{Cu^{2 + }}/Cu}^o} \right)(ECu2+/Cuo​) = +0.34

(EFe2+/Feo)\left( {E_{{Fe^{2 + }}/Fe}^o} \right)(EFe2+/Feo​) = -0.44

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