Tamil Nadu Board of Secondary EducationHSC Science Class 12th

Explain the variation in EMMEM3+/M2+0 3d series. - Chemistry

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Answer in Brief

Explain the variation in `"E"_ ("M"^(3+)//"M"^(2+))^0` 3d series.

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Transition metals in their high oxidation states tend to be oxidising. The standard reduction potential for the M3+/M2+ half cell gives the relative stability between M3+ and M2+.

Reaction Standard reduction potential (V)
\[\ce{Ti^3+ + e^- -> Ti^2+}\] −0.37
\[\ce{Y^3+ + e^- -> V^2+}\] −0.26
\[\ce{Cr^3+ + e^- -> Cr^2+}\] −0.41
\[\ce{Mn^3+ + e^- -> Mn^2+}\] +1.51
\[\ce{Fe^3+ + e^- -> Fe^2+}\] +0.77
\[\ce{Co^3+ + e^- -> Co^2+}\] +1.81

The negative values for titanium, vanadium and chromium indicate that the higher oxidation state is preferred.

The high reduction potential of M3+/M2+ indicates Mn2+ is more stable than Mn3+.

Concept: General Trend in Properties
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Tamil Nadu Board Samacheer Kalvi Class 12th Chemistry Volume 1 and 2 Answers Guide
Chapter 4 Transition and Inner Transition Elements
Evaluation | Q 14. | Page 128

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