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(i) With reference to structural variabi...

(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 states.
(iii) Complete the following equation: `MnO_4^(-) + 8H^(+) + 5e^(-) to`
(iv) Out of `Mn^(3+)` and `Cr^(3+)`, which is more paramagnetic and why? (Atomic nos.: Mn = 25, Cr = 24)

Text Solution

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(ii) Cerium `(Ce^(4+))`
(iii) `MnO_4^(-) +8H^(+) +5e^(-) to Mn^(2+) + 4H_2O`
(iv) `Mn^(3+)` is more paramgnetic.
Because `Mn^(3+)` has 4 unpaired electrons `(3d^4)` therefore more paramagnetic whereas `Cr^(3+)` has 3 unpaired electrons `(3d^5). `
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