(a) (i) This is due to the radioactive nature of actinoids and the poor shielding effect of 5f orbital in comparison to 4f orbital which are deeply penetrated.
(ii) Transition metals have vacant d orbital which makes them suitable for complex formation. Also their ability to show variable oxidation states helps in complex formation.
(b) 2MnO4- + 6H+ 5 S032-→2Mn2+ + 5SO42- + 3H2O
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