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The d-And-f-Block Elements

Short Answer Type

51. The first ionisation energies of third transition series is higher than those of first and second transition series. Why?

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52.

For the first row transition metals the E° values are:
E° V Cr Mn Fe Co Mc Cu
(M²⁺/M) –1.18 –0.91 –1.18 –0.44 –0.28 –0.25 +0.34
Explain the irregularity in the above values.

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53. Why is the E° value for the Mn³⁺/Mn²⁺ couple much more positive than that for Cr³⁺/Cr²⁺ or Fe³⁺/Fe²⁺? Explain.

The E° value for the Mn³⁺/Mn²⁺ couple much more positive than that for Cr³⁺/Cr²⁺ or Fe³⁺/Fe^2+.Much more third ionisation energy of Mn (where the required change is d⁵ to d⁴) is mainly responsible for this. This also explains why the +3 state of Mn is of little importance.

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