Transition and InnerTransition Elements - Result Question 95

####22. Four successive members of the first row transition elements listed below with atomic numbers. Which one of them is expected to have the highest EM3+/M2+ value? (2013 Main)

(a) Cr(Z=24)

(b) Mn(Z=25)

(c) Fe(Z=26)

(d) Co(Z=27)

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Solution:

  1. SRP value normally increases from left to right in the period of d-block elements. Some SRP value are exceptionally higher due to stability of product ion. e.g.

EMn3+/Mn2+0=+1.57V;ECo3+/Co2+0=+1.97V

Thus, EM3+/M2+ is highest for Co.



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