(a) Write ionic equations for the reaction of acidified potassium permanganate with following:
(i) Oxalic acid, (ii) `H_2 S`,
(iii) Sulphite ion.
(b ) Describe the reactivity of actinoids.

Explanation

(a) (i) ` 2MnO_(4)^(-) + 16 H^+ + 5C_2 O_(4)^(2-) to 2Mn^(2+) +8H_2O +10 CO_2`
`(ii) 2MnO_(4)^(-) + 5 S^(2-) to 2Mn^(2 +) +8H_2 O + 5S `
`(iii) 2MnO_4^(-) + 6H^(+) +5SO_(3)^(2-) to 2Mn^(2+) +3H_2 O +5SO_(4)^(2-)`
(b) Actinoids are highly reactive metals in the finely divided state due to low ionisation enthalpies
e.g (i) they react with most os the non - metals at moderate temperatures
(iii) they are attacked by hydrochlorice acid.