Ceric ammonium suphate and potassium permanganate are used as oxidising agents in acidic medium of ferrous ammonium suphate to ferric sulphate the ratio of number of moles of cerium ammonium suphate requred of moles of cerium ammonium suphate rquired per mole of ferrous ammoniium suphate to the number of moles of `KMnO_(4)` required per mole of ferrous ammonium suphate is

Options

A. 5
B. 0.2
C. 0.6
D. 2

Answer

a

Explanation

`MnO_(4)^(-)+8h^(+)+5e^(-)rarrMn^(2+)+4H_(2)O`
`(NH_(4))Ce(SO_(4))_(2)=Ce^(4+)`
and `(NH_(4))_(2)FeSO_(4)6H_(2)O=Fe^(2+)`
now `Ce^(+)+e^(-)rarrCe^(3+)`
`Fe^(2)rarrFe^(3+)+e^(-)`
since reduction of `KMnO_(4)` is a `5 e^(-)` change and oxidation of `(NH_(4))_(2)SO_(4) FeSO_(4).6H_(2)O` is a `1e^(-)` change therefore oxidation of 1 mole of `(NH_(4))_(2) SO_(4)FeSO_(4)6H_(2)O` will require `1//5` mole of `KMnO_(4)`
Further sicne reduction of `(NH_(4)A^(2))SO_(4)Ce(SO_(4)^(2))` is a `1 e^(-)` change and that of oxidation of therefore oxidation of 1 one mole of `(NH_(4)^(2))SO_(4)Ce(SO_(4))` thus the ratio of the number of moles of and `KMnO_(4)` required to oxidise 1 mole of `(NH_(4))(SO_(4)FeSO_(4).6H_(2))O` is `1:1//5` or 1