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Q 2636167972.     (i) With reference to structural variability and chemical reactivity, write the differences between lanthanoids and actinoids.
(ii) Name a member of the lanthanoid series which is well known to exhibit +4 oxidation state.
(iii) Complete the following equation :
`MnO_4^(-) +8H^(+) +5e^(-) ->`
(iv) Out of `Mn^(3+)` and `Cr^(3+)`, which is more paramagnetic and why? (Atomic nos. : Mn =25, Cr = 24)
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)