Of the d^4 species, Cr^2+ is strongly reducing while Mn^3+ is strongly oxidising. Why? Write two consequences of lanthanoid contraction. Which…

(a) Because Mn²⁺ is more stable due to stable 3d⁵ configuration whereas Cr³⁺ is more stable due to stable t₂g³ configuration. (b) Similar atomic radii of 4d and 5d series elements Separation of lanthanoids becomes difficult. (c) Zinc, due to weak interatomic interactions / Weak metallic bond.

CBSE 2025 · Region 2 · Set 2 · Q24 · 3 marks

(a)
Of the $\displaystyle \mathrm{d}^{4}$ species, $\displaystyle \mathrm{Cr}^{2+}$ is strongly reducing while $\displaystyle \mathrm{Mn}^{3+}$ is strongly oxidising. Why ?
(b)
Write two consequences of lanthanoid contraction.
(c)
Which element of 3d series has lowest enthalpy of atomisation and why ?

The d-and f-Block ElementsGeneral Properties of the Transition Elements (d-Block)Understandshort_answermedium

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(a)Of the $\displaystyle \mathrm{d}^{4}$ species, $\displaystyle \mathrm{Cr}^{2+}$ is strongly reducing while $\displaystyle \mathrm{Mn}^{3+}$ is strongly oxidising. Why ?(b)Write two consequences of lanthanoid contraction.(c)Which element of 3d series has lowest enthalpy of atomisation and why ?

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